GMC Denali bottom bracket and headset replacement?
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GMC Denali bottom bracket and headset replacement?
Hi all, I have one of those el cheapo orange GMC Denali road bikes (22.5" model). I put about 3000 miles on it last year and totally wore out the bottom bracket and the headset. I do not know much about bikes and my LBS recently went out of business. Does anyone know what replacement parts would fit?
After reading the forum for a bit, it seems the common consensus is to to just buy a higher end bike instead of repairing the Denali. However, I want to repair this bike because I plan to use it to commute to college where bike theft is pretty rampant. I got hooked on road biking with this cheap bike last year so I plan to buy a better bike in a few weeks but I do not want a $1500+ bike to get jacked.
After reading the forum for a bit, it seems the common consensus is to to just buy a higher end bike instead of repairing the Denali. However, I want to repair this bike because I plan to use it to commute to college where bike theft is pretty rampant. I got hooked on road biking with this cheap bike last year so I plan to buy a better bike in a few weeks but I do not want a $1500+ bike to get jacked.
#2
Senior Member
From the video description:
The box that my new BB came in states the following sizes: 68mm BSA and 122.5mm. I believe the first number is the length across the bottom of the frame's bottom bracket tube and the second number is the shaft length. Note that the original bottom bracket on this bike has a shaft slightly longer than the shaft on the replacement BB that I used, but the replacement worked just fine. The exact model information listed on the box above the barcode is "BB-UN55 122 BC137 68" Hope this helps.
#3
Newbie
Too expensive to fix?
You will be told to get a different bike from pretty much everyone, and they’d be right. But you made your point about riding it to school, so I get that too.
My guess is that you wouldn’t be changing the bottom bracket or headset yourself so you would have to source parts and pay for labour. I think your best bet, if you like the bike would be to buy a new one. They have it at Walmart for $199 and free shipping (I’m assuming you are in the USA). https://www.walmart.com/ip/GMC-Denal...White/49590912
This bike is pretty crapy. but if it serves it purpose for what you need, then that’s all that matters. I couldn’t find any info on the quick search I did for bottom bracket and headset info.
You may be better off looking for something used on kijiji.
Also there could be cheaper prices for this bike too, but at least you can return it easy to Walmart if it has any issues. Good luck and get yourself a real bike too.
check out these discount bike sellers for other options too.
Road Bikes | BikeShopWarehouse.com
Save up to 60% off Road Bikes, Free Ship 48, Schwinn, GT, Kestrel, Fuji, Motobecane and more Road bikes. Authorized dealer for Schwinn, GT, Kestrel, Fuji, Motobecane, Mercier, Gravity, Dawes road bikes. Shimano Carbon Road Bikes, Titanium Road Bikes,
My guess is that you wouldn’t be changing the bottom bracket or headset yourself so you would have to source parts and pay for labour. I think your best bet, if you like the bike would be to buy a new one. They have it at Walmart for $199 and free shipping (I’m assuming you are in the USA). https://www.walmart.com/ip/GMC-Denal...White/49590912
This bike is pretty crapy. but if it serves it purpose for what you need, then that’s all that matters. I couldn’t find any info on the quick search I did for bottom bracket and headset info.
You may be better off looking for something used on kijiji.
Also there could be cheaper prices for this bike too, but at least you can return it easy to Walmart if it has any issues. Good luck and get yourself a real bike too.
check out these discount bike sellers for other options too.
Road Bikes | BikeShopWarehouse.com
Save up to 60% off Road Bikes, Free Ship 48, Schwinn, GT, Kestrel, Fuji, Motobecane and more Road bikes. Authorized dealer for Schwinn, GT, Kestrel, Fuji, Motobecane, Mercier, Gravity, Dawes road bikes. Shimano Carbon Road Bikes, Titanium Road Bikes,
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Hi all, I have one of those el cheapo orange GMC Denali road bikes (22.5" model). I put about 3000 miles on it last year and totally wore out the bottom bracket and the headset. I do not know much about bikes and my LBS recently went out of business. Does anyone know what replacement parts would fit?
After reading the forum for a bit, it seems the common consensus is to to just buy a higher end bike instead of repairing the Denali. However, I want to repair this bike because I plan to use it to commute to college where bike theft is pretty rampant. I got hooked on road biking with this cheap bike last year so I plan to buy a better bike in a few weeks but I do not want a $1500+ bike to get jacked.
After reading the forum for a bit, it seems the common consensus is to to just buy a higher end bike instead of repairing the Denali. However, I want to repair this bike because I plan to use it to commute to college where bike theft is pretty rampant. I got hooked on road biking with this cheap bike last year so I plan to buy a better bike in a few weeks but I do not want a $1500+ bike to get jacked.
That being said, yes, it takes a 68mm English threaded UN54 bottom bracket and I think it's a 1 inch threaded head set if you're not boing to upgrade the stem and bars.
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#5
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Bike not worth the time energy or money to repair.
get another
get another
#6
Senior Member
You will be told to get a different bike from pretty much everyone, and they’d be right. But you made your point about riding it to school, so I get that too.
My guess is that you wouldn’t be changing the bottom bracket or headset yourself so you would have to source parts and pay for labour. I think your best bet, if you like the bike would be to buy a new one. They have it at Walmart for $199 and free shipping (I’m assuming you are in the USA). https://www.walmart.com/ip/GMC-Denal...White/49590912
This bike is pretty crapy. but if it serves it purpose for what you need, then that’s all that matters. I couldn’t find any info on the quick search I did for bottom bracket and headset info.
You may be better off looking for something used on kijiji.
Also there could be cheaper prices for this bike too, but at least you can return it easy to Walmart if it has any issues. Good luck and get yourself a real bike too.
check out these discount bike sellers for other options too.
Road Bikes | BikeShopWarehouse.com
Save up to 60% off Road Bikes, Free Ship 48, Schwinn, GT, Kestrel, Fuji, Motobecane and more Road bikes. Authorized dealer for Schwinn, GT, Kestrel, Fuji, Motobecane, Mercier, Gravity, Dawes road bikes. Shimano Carbon Road Bikes, Titanium Road Bikes,
My guess is that you wouldn’t be changing the bottom bracket or headset yourself so you would have to source parts and pay for labour. I think your best bet, if you like the bike would be to buy a new one. They have it at Walmart for $199 and free shipping (I’m assuming you are in the USA). https://www.walmart.com/ip/GMC-Denal...White/49590912
This bike is pretty crapy. but if it serves it purpose for what you need, then that’s all that matters. I couldn’t find any info on the quick search I did for bottom bracket and headset info.
You may be better off looking for something used on kijiji.
Also there could be cheaper prices for this bike too, but at least you can return it easy to Walmart if it has any issues. Good luck and get yourself a real bike too.
check out these discount bike sellers for other options too.
Road Bikes | BikeShopWarehouse.com
Save up to 60% off Road Bikes, Free Ship 48, Schwinn, GT, Kestrel, Fuji, Motobecane and more Road bikes. Authorized dealer for Schwinn, GT, Kestrel, Fuji, Motobecane, Mercier, Gravity, Dawes road bikes. Shimano Carbon Road Bikes, Titanium Road Bikes,
That would be way smarter than putting money into a Walmart bike or even fixing this GMC thing. That bike would easily last your entire academic career. My son's bike (he's in school for a PhD) has been going 8 years now and hasn't missed a beat. That's a 1980 vintage Motebecane with that very low end campy drivetrain that they offered and handbuilt wheels on campy hubs.
j.
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Thanks for the response, mynewnchome. I found one on amazon for $22 along with the crank tool for a few bucks more.
But I honestly can’t tell if you guys are trolling or not with the “buy a new bike thing”. I don’t have an issue buying a $20 part and a few tools to do it myself. At the very least I see no harm spending an hour or two learning a new skill. I do have an issue with tossing out a bike that can be repaired let alone one that could get stolen/parted out when parked on campus.
But I honestly can’t tell if you guys are trolling or not with the “buy a new bike thing”. I don’t have an issue buying a $20 part and a few tools to do it myself. At the very least I see no harm spending an hour or two learning a new skill. I do have an issue with tossing out a bike that can be repaired let alone one that could get stolen/parted out when parked on campus.
#8
Senior Member
It all depends on your needs and wants. Whatever works for you.
#9
Banned
Made up of nothing weird , just got the cheapest of the parts available , ..
you need to buy thevtools and then similar parts , which will probably be better
ignore the voice in your head saying, " but it cost more than I paid for the bike" (or Not)
Of course it did, you bought a low cost bike .. it's a sum of it's parts ....
...
you need to buy thevtools and then similar parts , which will probably be better
ignore the voice in your head saying, " but it cost more than I paid for the bike" (or Not)
Of course it did, you bought a low cost bike .. it's a sum of it's parts ....
...
Last edited by fietsbob; 03-17-19 at 07:06 PM.
#10
Senior Member
Thanks for the response, mynewnchome. I found one on amazon for $22 along with the crank tool for a few bucks more.
But I honestly can’t tell if you guys are trolling or not with the “buy a new bike thing”. I don’t have an issue buying a $20 part and a few tools to do it myself. At the very least I see no harm spending an hour or two learning a new skill. I do have an issue with tossing out a bike that can be repaired let alone one that could get stolen/parted out when parked on campus.
But I honestly can’t tell if you guys are trolling or not with the “buy a new bike thing”. I don’t have an issue buying a $20 part and a few tools to do it myself. At the very least I see no harm spending an hour or two learning a new skill. I do have an issue with tossing out a bike that can be repaired let alone one that could get stolen/parted out when parked on campus.
eobist parts and are made fraterials that don’t weather as well. Walk around a campus and look at the bikes in the rack and you’ll be able to tell that easily.
A bike for an undergrad without a car becomes sort of a mission critical piece of equipment. If it doesn’t work right, it’s worth nothing and becomes a huge hassle. Eventually it will be like all the other abandoned cheap bikes you’ll see.
But whatever “turns your crank”. Just giving you the benefit of our 12 student- years of experience with bikes on urban campuses in a northern campus subjected to all kinds of weather. . Used is a huge bargain and far better than what you have there for marginally more money.
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Thanks for the response, mynewnchome. I found one on amazon for $22 along with the crank tool for a few bucks more.
But I honestly can’t tell if you guys are trolling or not with the “buy a new bike thing”. I don’t have an issue buying a $20 part and a few tools to do it myself. At the very least I see no harm spending an hour or two learning a new skill. I do have an issue with tossing out a bike that can be repaired let alone one that could get stolen/parted out when parked on campus.
But I honestly can’t tell if you guys are trolling or not with the “buy a new bike thing”. I don’t have an issue buying a $20 part and a few tools to do it myself. At the very least I see no harm spending an hour or two learning a new skill. I do have an issue with tossing out a bike that can be repaired let alone one that could get stolen/parted out when parked on campus.
Park Tool (109917) HCW-5 Lock Spanner
https://www.amazon.com/dp/B000C17KRI..._MH3JCbJ16KMHR
And an installation tool for the bottom bracket, if you got a sealed beating cartridge style.
Bikehand Bike Bicycle Shimano Bottom Bracket Removal Remover Tool
https://www.amazon.com/dp/B00811WQJS..._YK3JCbCQSXAEK
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I forgot to post an update. Long story short I was able to replace the BB and the bike rides great again. I had a change in work/life circumstances and ended up buying a Cannondale Synapse to replace the Denali but I am keeping it as a commuter bike.
Unfortunately I can’t post links yet but I was able to get everything from Amazon. I was able to repair the bottom bracket with the following part:
SHIMANO UN55 BB Square Taper Bottom Bracket (68x122.5mm) (about $22)
And I got the following special tools. I avoided buying the two special left and right hand side bottom bracket tools since I would be switching to the Shimano style.
Bikehand Bike Bicycle Shimano Bottom Bracket Removal Remover Tool ($10)
Park Tool CCP-22 Crank Puller ($15)
(a hammer and long screw driver would have worked in hindsight)
and I also needed anti seize grease, a 14” pipe wrench, a hammer, and 2” channel locks. A 2” washer, 5/8ths x 3” screw with nut with some WD-40 was also needed.
Taking the cranks off was a breeze. I used the 2” channel locks to take out the left bearing cup (side with the three key holes).
But the right hand fixed cup was a beast to get out. It wouldn’t budge with channel locks. I tried an adjustable wrench, nothing. Tried a Sheldon tool. Nothing. Tried heating it with a small blow torch. Nothing. Let PB blaster soak in over night and retried. Nothing.
Eventually I put the pipe wrench on it, used a 5/8” bolt with a washer through the fixed cup to keep the wrench from falling off, then I used a hammer to tap the wrench until it turned. Once it was broken free, it came right out.
So at the end of the day I was able to fix the bike for about $35 if you don’t count the crank tool. I’m pretty happy with that.
Unfortunately I can’t post links yet but I was able to get everything from Amazon. I was able to repair the bottom bracket with the following part:
SHIMANO UN55 BB Square Taper Bottom Bracket (68x122.5mm) (about $22)
And I got the following special tools. I avoided buying the two special left and right hand side bottom bracket tools since I would be switching to the Shimano style.
Bikehand Bike Bicycle Shimano Bottom Bracket Removal Remover Tool ($10)
Park Tool CCP-22 Crank Puller ($15)
(a hammer and long screw driver would have worked in hindsight)
and I also needed anti seize grease, a 14” pipe wrench, a hammer, and 2” channel locks. A 2” washer, 5/8ths x 3” screw with nut with some WD-40 was also needed.
Taking the cranks off was a breeze. I used the 2” channel locks to take out the left bearing cup (side with the three key holes).
But the right hand fixed cup was a beast to get out. It wouldn’t budge with channel locks. I tried an adjustable wrench, nothing. Tried a Sheldon tool. Nothing. Tried heating it with a small blow torch. Nothing. Let PB blaster soak in over night and retried. Nothing.
Eventually I put the pipe wrench on it, used a 5/8” bolt with a washer through the fixed cup to keep the wrench from falling off, then I used a hammer to tap the wrench until it turned. Once it was broken free, it came right out.
So at the end of the day I was able to fix the bike for about $35 if you don’t count the crank tool. I’m pretty happy with that.
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#13
Rhapsodic Laviathan
Thanks for the response, mynewnchome. I found one on amazon for $22 along with the crank tool for a few bucks more.
But I honestly can’t tell if you guys are trolling or not with the “buy a new bike thing”. I don’t have an issue buying a $20 part and a few tools to do it myself. At the very least I see no harm spending an hour or two learning a new skill. I do have an issue with tossing out a bike that can be repaired let alone one that could get stolen/parted out when parked on campus.
But I honestly can’t tell if you guys are trolling or not with the “buy a new bike thing”. I don’t have an issue buying a $20 part and a few tools to do it myself. At the very least I see no harm spending an hour or two learning a new skill. I do have an issue with tossing out a bike that can be repaired let alone one that could get stolen/parted out when parked on campus.
#14
Rhapsodic Laviathan
Yes it will. The paint is really thick and it's aluminum. The fork is hiten steel, the frame is 4130 aluminum... aircraft grade oOoOoOo
#15
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I rode a cheap heavy steel mountain bike at 26 stone, the first thing that went was the bearings in the front wheel and I had to true the 26" wheels more than once when I hit pot-holes. I lost weight rapidly but after riding perhaps a couple thousand miles in total which by then I was maybe 18-19 stone I replaced the caged bearings of the bottom bracket with new loose bearings and fresh marine grease. The bearings were only about a £1 delivered (probably ebay). The bottom bracket was as good as new. It can be a bit finicky adjusting the bottom bracket for no play. Pretty sure I rode it for about a week and then had to adjust it again but that second time lasted a very long time. I could of gone with a sealed bottom bracket but I really didn't need to, the original only needed fresh bearings and grease and it spinned much better with loose ball-bearings. I'm just making the point you probably could have bought it back to good working condition spending even less money. There are millions of bikes all over Africa getting huge abuse and being massively over-loaded and they don't have fancy sealed bottom brackets etc that wouldn't be cost effective to them.
#16
Senior Member
better bikes do better. Been there done that - for years.
#17
Rhapsodic Laviathan
That’s not been our experience with about 12 years experience with bikes on campus. Aluminum parts corrode, lubrications gets washed off, etc.. chain isn’t aluminum, neither are the springs in brakes and derailleur. Cables aren’t. All of that suffers in weather. And if any of those things fail, your bike can become unrideable.
better bikes do better. Been there done that - for years.
better bikes do better. Been there done that - for years.
#18
Senior Member
Go to a university and walk through the bike racks outside student housing in the fall and then again in the spring. It’s pretty obvious what works and what doesn’t.
#19
Rhapsodic Laviathan
Oh yeah, I know. I live near UofLs main campus. Wax coated ones is what the co-op has, I use the famous blue grease when I install them. Rub the cables down with a thin layer. Mine often sit outside if in use and I don't have the problems unless mine sit outside unused. I think some bikes there get parted out before they return back to the earth.
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4130 is chromoly steel. GMC Denali if aluminium is going to be 6061 aluminium or perhaps 7005 for older models. If steel likely to be a high tensile steel or one of the newer high carbon steels which they still call high tensile, very unlikely to be 4130 chromoly steel which is more expensive to manufacture than aluminium these days.
I think they call 6061 aircraft grade aluminium because it's less brittle and more fatigue resistant than 7005 aluminium.
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Thanks for the response, mynewnchome. I found one on amazon for $22 along with the crank tool for a few bucks more.
But I honestly can’t tell if you guys are trolling or not with the “buy a new bike thing”. I don’t have an issue buying a $20 part and a few tools to do it myself. At the very least I see no harm spending an hour or two learning a new skill. I do have an issue with tossing out a bike that can be repaired let alone one that could get stolen/parted out when parked on campus.
But I honestly can’t tell if you guys are trolling or not with the “buy a new bike thing”. I don’t have an issue buying a $20 part and a few tools to do it myself. At the very least I see no harm spending an hour or two learning a new skill. I do have an issue with tossing out a bike that can be repaired let alone one that could get stolen/parted out when parked on campus.
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4130 is chromoly steel. GMC Denali if aluminium is going to be 6061 aluminium or perhaps 7005 for older models. If steel likely to be a high tensile steel or one of the newer high carbon steels which they still call high tensile, very unlikely to be 4130 chromoly steel which is more expensive to manufacture than aluminium these days.
I think they call 6061 aircraft grade aluminium because it's less brittle and more fatigue resistant than 7005 aluminium.
I think they call 6061 aircraft grade aluminium because it's less brittle and more fatigue resistant than 7005 aluminium.
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I forgot to post an update. Long story short I was able to replace the BB and the bike rides great again. I had a change in work/life circumstances and ended up buying a Cannondale Synapse to replace the Denali but I am keeping it as a commuter bike.
Unfortunately I can’t post links yet but I was able to get everything from Amazon. I was able to repair the bottom bracket with the following part:
SHIMANO UN55 BB Square Taper Bottom Bracket (68x122.5mm) (about $22)
And I got the following special tools. I avoided buying the two special left and right hand side bottom bracket tools since I would be switching to the Shimano style.
Bikehand Bike Bicycle Shimano Bottom Bracket Removal Remover Tool ($10)
Park Tool CCP-22 Crank Puller ($15)
(a hammer and long screw driver would have worked in hindsight)
and I also needed anti seize grease, a 14” pipe wrench, a hammer, and 2” channel locks. A 2” washer, 5/8ths x 3” screw with nut with some WD-40 was also needed.
Taking the cranks off was a breeze. I used the 2” channel locks to take out the left bearing cup (side with the three key holes).
But the right hand fixed cup was a beast to get out. It wouldn’t budge with channel locks. I tried an adjustable wrench, nothing. Tried a Sheldon tool. Nothing. Tried heating it with a small blow torch. Nothing. Let PB blaster soak in over night and retried. Nothing.
Eventually I put the pipe wrench on it, used a 5/8” bolt with a washer through the fixed cup to keep the wrench from falling off, then I used a hammer to tap the wrench until it turned. Once it was broken free, it came right out.
So at the end of the day I was able to fix the bike for about $35 if you don’t count the crank tool. I’m pretty happy with that.
Unfortunately I can’t post links yet but I was able to get everything from Amazon. I was able to repair the bottom bracket with the following part:
SHIMANO UN55 BB Square Taper Bottom Bracket (68x122.5mm) (about $22)
And I got the following special tools. I avoided buying the two special left and right hand side bottom bracket tools since I would be switching to the Shimano style.
Bikehand Bike Bicycle Shimano Bottom Bracket Removal Remover Tool ($10)
Park Tool CCP-22 Crank Puller ($15)
(a hammer and long screw driver would have worked in hindsight)
and I also needed anti seize grease, a 14” pipe wrench, a hammer, and 2” channel locks. A 2” washer, 5/8ths x 3” screw with nut with some WD-40 was also needed.
Taking the cranks off was a breeze. I used the 2” channel locks to take out the left bearing cup (side with the three key holes).
But the right hand fixed cup was a beast to get out. It wouldn’t budge with channel locks. I tried an adjustable wrench, nothing. Tried a Sheldon tool. Nothing. Tried heating it with a small blow torch. Nothing. Let PB blaster soak in over night and retried. Nothing.
Eventually I put the pipe wrench on it, used a 5/8” bolt with a washer through the fixed cup to keep the wrench from falling off, then I used a hammer to tap the wrench until it turned. Once it was broken free, it came right out.
So at the end of the day I was able to fix the bike for about $35 if you don’t count the crank tool. I’m pretty happy with that.
Squeeze every mile you can out of that bike. Now that you've worked on it, it's become an investment of your time. The crank puller and bottom bracket tools will serve you well over the years, keep them in a safe place.
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