Replacing Biopace chainrings
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Replacing Biopace chainrings
Alright so my Bianchi has Shimano FC-1050 105 cranks. Velobase tells me it has 130mm BCD. I want to buy round chainrings for that crank.
Here is what I'm looking at buying. Are they compatible? Any other reason to avoid them?
52T
42T
Thanks
Here is what I'm looking at buying. Are they compatible? Any other reason to avoid them?
52T
42T
Thanks
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That seems like a lot for off-brand chainrings IMO. Could get some real Shimano ones for that price. Even slightly used you'll do well.
#4
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I changed my 42t biopace ring with a 39t round one and it makes a world of diff.on hills.The 39t was specialized.Works great.
#5
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Alright so my Bianchi has Shimano FC-1050 105 cranks. Velobase tells me it has 130mm BCD. I want to buy round chainrings for that crank.
Here is what I'm looking at buying. Are they compatible? Any other reason to avoid them?
52T
42T
Thanks
Here is what I'm looking at buying. Are they compatible? Any other reason to avoid them?
52T
42T
Thanks
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I had to do the same with my Shimano 600 Biopace. I never really shopped for chainrings and suprised on how expensive they were! I just kept waiting until a US seller had them. But Niagara cycles has good prices for SR rings. Try searching Amazon. Sometimes, the thing you need is sold through Amazon but fullfilled by Niagara cycles and Amazon charges less for shipping.
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Great, thanks for the replies everyone. I am not too concerned about long shipping times, as it will be at least 2 months before I can actually go ride outside.
The same seller has SRAM powerglide chainrings 39T/53T for $75 shipped. Is that an okay deal, or should I look for something cheaper? Kind of feels like overkill to spend that much.
The same seller has SRAM powerglide chainrings 39T/53T for $75 shipped. Is that an okay deal, or should I look for something cheaper? Kind of feels like overkill to spend that much.
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+1 on that. I just bought a new bottom bracket from them. Shipping was about $4 ordering via Amazon and more than twice that directly from Niagara's own site.
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I bought a 39T Shimano chain ring off ebay to replace my 42T biopace for less $2. The shipping was more than the cost.
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You posted a long time ago but had a question for you. I have a similar old bike and had a bike shop replace my freewheel to a 28t. My plan was to get a new crank and derailleur for under $100 ish. Was that 3t jump enough to get you up hills? I am literally passed by senior women on hills. That happened lol.
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Have you ridden with your new 28 yet. That may be enough. However, 3 teeth in the front make a difference. Riding lots is more better.
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The percentage change is what is important. Us you can go to 38 on a 130 bcd if you can find one. 42 to 39 is about 7 to 8 percent change a 38 would be 10. Its about a half step lower in terms of touring gears.
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I have. It helped!! I was grateful and it was worth the $. I am in the Northeast, many rides in my area surpass 2K cumulative feet, and on this thing that is rough. It's a great workout for sure.
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I ended up getting this crank with the same chainline as my current crank, and this DR if my current one has issues with the 34t chainwheel.
I have learned so much from the advice from people like you. Many thanks. If I **** the entire thing up, I am not out that much money lol. Only way you learn.
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#15
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You posted a long time ago but had a question for you. I have a similar old bike and had a bike shop replace my freewheel to a 28t. My plan was to get a new crank and derailleur for under $100 ish. Was that 3t jump enough to get you up hills? I am literally passed by senior women on hills. That happened lol.
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I am 41 and in great shape but would like my knees and tendons to not get injured. I die inside if I cannot stay active. At least with the lower gears, it's my choice to torture myself which I do plenty as it is.
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May I ask how you find the % change? 42/28 is 1.5 ratio and 39/28 is 1.39. Does the difference in ratio calculate percentage?
I ended up getting this crank with the same chainline as my current crank, and this DR if my current one has issues with the 34t chainwheel.
I have learned so much from the advice from people like you. Many thanks. If I **** the entire thing up, I am not out that much money lol. Only way you learn.
I ended up getting this crank with the same chainline as my current crank, and this DR if my current one has issues with the 34t chainwheel.
I have learned so much from the advice from people like you. Many thanks. If I **** the entire thing up, I am not out that much money lol. Only way you learn.
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You posted a long time ago but had a question for you. I have a similar old bike and had a bike shop replace my freewheel to a 28t. My plan was to get a new crank and derailleur for under $100 ish. Was that 3t jump enough to get you up hills? I am literally passed by senior women on hills. That happened lol.
I've put a set of 52/42 Biopace back on that bike, but will probably go back to the 50/39 or 50/38 chainring setup, with the 13-28 freewheel. The only thing I lose with that gear combo is I'm spun out on fast downhills with a tailwind. Not a big deal since I don't use that bike to chase Strava KOMs or PRs. I have another bike for that. I prefer to keep my steel road bike comfy for long rides on roller coaster terrain with lots of short, steep climbs.
Check out Vuelta chainrings. Best buy in top quality chainrings. I have them in 50T (ramped and pinned for better shifting) and 39 and 38 plain rings (no need for ramped and pinned small chainrings on most bike/shifter setups).
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Go for it. After an injury and illness in 2018 I was pretty weak. I replaced my 52/42 chainrings with 50/39, then a 38T small chainring, and swapped from a 7-speed 13-25 to 13-28 freewheel. Helped a lot on climbs and riding into stiff headwinds while I was getting back into shape.
I've put a set of 52/42 Biopace back on that bike, but will probably go back to the 50/39 or 50/38 chainring setup, with the 13-28 freewheel. The only thing I lose with that gear combo is I'm spun out on fast downhills with a tailwind. Not a big deal since I don't use that bike to chase Strava KOMs or PRs. I have another bike for that. I prefer to keep my steel road bike comfy for long rides on roller coaster terrain with lots of short, steep climbs.
Check out Vuelta chainrings. Best buy in top quality chainrings. I have them in 50T (ramped and pinned for better shifting) and 39 and 38 plain rings (no need for ramped and pinned small chainrings on most bike/shifter setups).
I've put a set of 52/42 Biopace back on that bike, but will probably go back to the 50/39 or 50/38 chainring setup, with the 13-28 freewheel. The only thing I lose with that gear combo is I'm spun out on fast downhills with a tailwind. Not a big deal since I don't use that bike to chase Strava KOMs or PRs. I have another bike for that. I prefer to keep my steel road bike comfy for long rides on roller coaster terrain with lots of short, steep climbs.
Check out Vuelta chainrings. Best buy in top quality chainrings. I have them in 50T (ramped and pinned for better shifting) and 39 and 38 plain rings (no need for ramped and pinned small chainrings on most bike/shifter setups).
#21
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With conventional round chainrings the orientation doesn't matter. With non-round eccentric chainrings (Biopace, Absolute Black and others), orientation of the elongated lobes is usually critical to best performance. However opinions differ about optimal position so some folks re-orient the elongated lobes to suit themselves. I've tried that with Biopace but eventually went back to the original factory orientation.
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No I bought a bike(Lemond Tourmalet with an original triple.
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Originally Posted by canklecat;21426002}With conventional round chainrings the orientation doesn't matter. With non-round eccentric chainrings (Biopace, Absolute Black and others), orientation of the elongated lobes is usually critical to best performance. However opinions differ about optimal position so some folks re-orient the elongated lobes to suit themselves. I've tried that with Biopace [b
but eventually went back to the original factory orientation[/b].
JMO of course
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Almost all my bikes have triples. I don’t see the point in trying to be heroic. Like you say, the triple has a 39T ring and you can choose that if you want to challenge yourself. If not, put it in the small ring and spin. Chris Froome has been known to use a 34-32 low gear in pro tour stages in recent years. I figure if he can use that, no gear I choose will be wimpy when adjusted for fitness level.
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You posted a long time ago but had a question for you. I have a similar old bike and had a bike shop replace my freewheel to a 28t. My plan was to get a new crank and derailleur for under $100 ish. Was that 3t jump enough to get you up hills? I am literally passed by senior women on hills. That happened lol.