Compact chainrings on a triple set up
#1
Full Member
Thread Starter
Join Date: Mar 2017
Posts: 211
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 106 Post(s)
Likes: 0
Liked 8 Times
in
6 Posts
Compact chainrings on a triple set up
Hello,
I just got a very sweet deal on a bike but the gray triple chainring that comes with the bike is far from ideal to me.
A black chainring would look so much better as there is a bit of black on frame, and Compact looks also nicer than a triple that I don't really need.
Anyway, question is : can I just swap the triple rings for a compact double, and keep the triple shifters + front mech ?
Groupset is 105 5800 (chainring probably isn't 105 5800 though since it's all gray without any righting on it)
Kind regards
edit : a double front mech wouldn't cost that much, if a triple front mech doesn't work with 2 chainrings, can I put pretty much any double front mech I find ?
I just got a very sweet deal on a bike but the gray triple chainring that comes with the bike is far from ideal to me.
A black chainring would look so much better as there is a bit of black on frame, and Compact looks also nicer than a triple that I don't really need.
Anyway, question is : can I just swap the triple rings for a compact double, and keep the triple shifters + front mech ?
Groupset is 105 5800 (chainring probably isn't 105 5800 though since it's all gray without any righting on it)
Kind regards
edit : a double front mech wouldn't cost that much, if a triple front mech doesn't work with 2 chainrings, can I put pretty much any double front mech I find ?
Last edited by dirtydozen; 05-13-20 at 05:24 PM.
#2
Senior Member
Join Date: Aug 2007
Posts: 1,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 138 Post(s)
Liked 16 Times
in
13 Posts
Hello,
I just got a very sweet deal on a bike but the gray triple chainring that comes with the bike is far from ideal to me.
A black chainring would look so much better as there is a bit of black on frame, and Compact looks also nicer than a triple that I don't really need.
Anyway, question is : can I just swap the triple rings for a compact double, and keep the triple shifters + front mech ?
Groupset is 105 5800 (chainring probably isn't 105 5800 though since it's all gray without any righting on it)....
I just got a very sweet deal on a bike but the gray triple chainring that comes with the bike is far from ideal to me.
A black chainring would look so much better as there is a bit of black on frame, and Compact looks also nicer than a triple that I don't really need.
Anyway, question is : can I just swap the triple rings for a compact double, and keep the triple shifters + front mech ?
Groupset is 105 5800 (chainring probably isn't 105 5800 though since it's all gray without any righting on it)....
#3
Full Member
Thread Starter
Join Date: Mar 2017
Posts: 211
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 106 Post(s)
Likes: 0
Liked 8 Times
in
6 Posts
It comes from a bikeshop and the guy told me it was 11x3. Maybe it's not 105 5800 shifters then, but since its 11 speed should be a recent pair of shifters
#4
Full Member
Thread Starter
Join Date: Mar 2017
Posts: 211
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 106 Post(s)
Likes: 0
Liked 8 Times
in
6 Posts
I just got the bike delivered, actually it's a 10 speed, so it's not 105 5800 like the bike shop said.
So to go from triple crankset to 50/34, can I get away with simply buying new chairings or cranks and keep my triple shifter and front mech ?
thanks
So to go from triple crankset to 50/34, can I get away with simply buying new chairings or cranks and keep my triple shifter and front mech ?
thanks
#5
Asleep at the bars
Join Date: May 2006
Location: San Francisco, CA and Treasure Island, FL
Posts: 1,743
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 234 Post(s)
Liked 203 Times
in
135 Posts
You need a new crankset. If you go Shimano-Shimano you can probably keep the bottom bracket. (This is the part with bearings the crank axle goes through. The may be some combinations that require a new BB... but probably not.) You need a new front derailleur. You can keep the triple shifter. You can use an 11sp crankset if you wish, they're fully compatible with 10sp Shimano drivetrains. (Like Shimano R7000 105 @ $150 or R8000 Ultegra @ $200 online. Or FSA SL-K, but then you definitely need a new BB.)
Likes For sfrider:
#6
Senior Member
Join Date: Sep 2005
Location: In the foothills of Los Angeles County
Posts: 25,251
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 8261 Post(s)
Liked 8,996 Times
in
4,455 Posts
The bolt circle diameter is different between a compact and a triple so the rings won't fit.
#7
Senior Member
That said, triple-to-double crank conversions will always perplex me. It often doesn't buy you anything with respect to q or chainline. And it's not like 1x where you get a tangible increase to the bike's simplicity. So you're often giving up a wider front range and snappier tighter front shifts for basically nothing, especially if your shifter already works with the existing rings.
Likes For HTupolev:
#10
Zoom zoom zoom zoom bonk
Join Date: Sep 2006
Location: New Zealand
Posts: 4,624
Bikes: Giant Defy, Trek 1.7c, BMC GF02, Fuji Tahoe, Scott Sub 35, Kona Rove, Trek Verve+2
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 551 Post(s)
Liked 722 Times
in
366 Posts
You should keep the triple. Move to somewhere with hills and bike shops that can count properly.
#11
Senior Member
Join Date: Sep 2005
Location: In the foothills of Los Angeles County
Posts: 25,251
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 8261 Post(s)
Liked 8,996 Times
in
4,455 Posts
.
That said, triple-to-double crank conversions will always perplex me. It often doesn't buy you anything with respect to q or chainline. And it's not like 1x where you get a tangible increase to the bike's simplicity. So you're often giving up a wider front range and snappier tighter front shifts for basically nothing, especially if your shifter already works with the existing rings.
That said, triple-to-double crank conversions will always perplex me. It often doesn't buy you anything with respect to q or chainline. And it's not like 1x where you get a tangible increase to the bike's simplicity. So you're often giving up a wider front range and snappier tighter front shifts for basically nothing, especially if your shifter already works with the existing rings.
It's Ultegra with 130bcd.
Last edited by big john; 05-17-20 at 08:28 AM.
#12
Senior Member
Join Date: Apr 2007
Posts: 6,760
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 1109 Post(s)
Liked 1,200 Times
in
760 Posts
Buy a new compact double that you like the looks of and whatever BB that crank specifies. Sell the triple w/ accompanying BB on eBay. There's actually a pretty good market for them. You'll offset the cost outlay nicely.
Use your existing triple shifter and front derailleur. It's possible the FD won't shift well, but I'd bet it will work fine and you won't bother changing. If, for any reason, you're not happy with the front shifting, assuming you know how to set up and adjust it well, buy a new FD. They're very cheap, especially on eBay. Get any one that strikes your fancy, but probably best to match with Shimano 10 speed offerings. Not critical though.
Scold the bike shop for such a dumb mistake "3X11". Really dumb, amateurish. Ask them for $100 off because you were expecting something more current than what you got (but.... what you got is fine!).
Use your existing triple shifter and front derailleur. It's possible the FD won't shift well, but I'd bet it will work fine and you won't bother changing. If, for any reason, you're not happy with the front shifting, assuming you know how to set up and adjust it well, buy a new FD. They're very cheap, especially on eBay. Get any one that strikes your fancy, but probably best to match with Shimano 10 speed offerings. Not critical though.
Scold the bike shop for such a dumb mistake "3X11". Really dumb, amateurish. Ask them for $100 off because you were expecting something more current than what you got (but.... what you got is fine!).
#13
Full Member
Thread Starter
Join Date: Mar 2017
Posts: 211
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 106 Post(s)
Likes: 0
Liked 8 Times
in
6 Posts
Buy a new compact double that you like the looks of and whatever BB that crank specifies. Sell the triple w/ accompanying BB on eBay. There's actually a pretty good market for them. You'll offset the cost outlay nicely.
Use your existing triple shifter and front derailleur. It's possible the FD won't shift well, but I'd bet it will work fine and you won't bother changing. If, for any reason, you're not happy with the front shifting, assuming you know how to set up and adjust it well, buy a new FD. They're very cheap, especially on eBay. Get any one that strikes your fancy, but probably best to match with Shimano 10 speed offerings. Not critical though.
Scold the bike shop for such a dumb mistake "3X11". Really dumb, amateurish. Ask them for $100 off because you were expecting something more current than what you got (but.... what you got is fine!).
Use your existing triple shifter and front derailleur. It's possible the FD won't shift well, but I'd bet it will work fine and you won't bother changing. If, for any reason, you're not happy with the front shifting, assuming you know how to set up and adjust it well, buy a new FD. They're very cheap, especially on eBay. Get any one that strikes your fancy, but probably best to match with Shimano 10 speed offerings. Not critical though.
Scold the bike shop for such a dumb mistake "3X11". Really dumb, amateurish. Ask them for $100 off because you were expecting something more current than what you got (but.... what you got is fine!).
It's alright, i always rode on 9 or less so I'm happy with 10. But yeah when I got the bike I was a bit pissed because some stuff he said on the phone weren't true. But on the other hand he didn't mention i'd get carbon handlebar and stem lol..
It was a very good deal so in the end I don't mind his "lies".
That said, triple-to-double crank conversions will always perplex me. It often doesn't buy you anything with respect to q or chainline. And it's not like 1x where you get a tangible increase to the bike's simplicity. So you're often giving up a wider front range and snappier tighter front shifts for basically nothing, especially if your shifter already works with the existing rings.
That being said, a black triple would do the job too, it's ok.
#14
Senior Member
Join Date: Jul 2020
Posts: 702
Bikes: '23 Poseidon Redwood, '07 Specialized Roubaix Comp Triple, '12 Gravity Fixie, '21 Liv Rove 4, '06? Giant EB Spirit
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 345 Post(s)
Liked 237 Times
in
151 Posts
I just got back into riding after about a 10 year absence. I have a Specialized Roubaix Comp (that's the model) with a Triple chainring. At the time Compacts were just gaining wide use. I was kicking myself at the time for not going with a compact as "it looked cooler". Well forward to today and I thank God for the granny gear when I'm climbing hills. I would not have made some of the climbs without it. As I get stronger I may not need it but as I get older I want to protect my knees.
So, if you want to hold onto the bike you might keep it as is as later like me you might regret the change.
So, if you want to hold onto the bike you might keep it as is as later like me you might regret the change.
Likes For Symox: