Component Help
10-06-20, 11:18 AM
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Component Help
Hi, I am fairly naive as it comes to bike components so you'll have to excuse me if this question seems elementary or misguided. I am looking into swapping out the crankset on my 2015 Cannondale SuperSix Evo Black Inc and could use some advice on options. I love to climb but am not strong enough to do what I want comfortably on my current 39/28 low gear and would love to get that ratio to 34/28 or so. Currently, I have cannondale hollowgram SL crank arms, a cannondale si spider (with SRM power meter but wouldn't be too worried about losing that), and 54/39 praxis rings. All other components are Dura Ace 7900 (10spd). I'd appreciate any advice on moderately economical options that I could pursue. Thanks in advance
10-06-20, 11:35 AM
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Sounds like you have a 130mm BCD cranks, so just swapping to a 34t ring isn't an option (the ring is too small to fit) and I wouldn't want to lose the power meter.
Swapping out the cassette is likely the easiest and most affordable option, if your rear derailleur can handle a 32 tooth cog (you'd likely need a new chain, too).
Swapping out the cassette is likely the easiest and most affordable option, if your rear derailleur can handle a 32 tooth cog (you'd likely need a new chain, too).
10-06-20, 11:46 AM
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Sounds like you have a 130mm BCD cranks, so just swapping to a 34t ring isn't an option (the ring is too small to fit) and I wouldn't want to lose the power meter.
Swapping out the cassette is likely the easiest and most affordable option, if your rear derailleur can handle a 32 tooth cog (you'd likely need a new chain, too).
Swapping out the cassette is likely the easiest and most affordable option, if your rear derailleur can handle a 32 tooth cog (you'd likely need a new chain, too).
10-06-20, 12:28 PM
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10-06-20, 12:41 PM
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It's confusing to understand what you have and what you are wanting.
Your current crank has 54/39 rings and your cassette is 11-28 ten speed?
Shimano or SRAM derailleurs? With Shimano, the exact model number of the DR can make a difference, don't know how SRAM specs them myself.
Whether you change rings, cassette or both, then you have to take into consideration the DR's you have. Otherwise it may not handle things like the amount of chain slack you'll have when in the small small, or the DR won't physically clear the big cog on the cassette. Front DR's can have issues with smaller chain wheels than what is normal for pairing with the big ring. And... etc.
You might expect this thread to get moved to the Bicycle Mechanics sub-forum. That's where you get help with mechanical issues like this.
Your current crank has 54/39 rings and your cassette is 11-28 ten speed?
Shimano or SRAM derailleurs? With Shimano, the exact model number of the DR can make a difference, don't know how SRAM specs them myself.
Whether you change rings, cassette or both, then you have to take into consideration the DR's you have. Otherwise it may not handle things like the amount of chain slack you'll have when in the small small, or the DR won't physically clear the big cog on the cassette. Front DR's can have issues with smaller chain wheels than what is normal for pairing with the big ring. And... etc.
You might expect this thread to get moved to the Bicycle Mechanics sub-forum. That's where you get help with mechanical issues like this.
Last edited by Iride01; 10-06-20 at 12:45 PM.
10-06-20, 01:23 PM
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If you don't mind losing the SRM, just go on eBay or to your local Cannondale dealer and buy a compact replacement spider for your crankset. Here is one for $60: https://www.ebay.com/itm/Cannondale-...AAAOSwI2xbftQU. Then just bolt on some compact rings.
You will need a special tool to replace the SRM with a regular compact spider.
Alternatively, you can replace the RD with a longer cage option and go up to a 32 or 34 cassette. You may be able to use a Wolf Tooth adapter in lieu of a different RD, but I am not sure. Regardless, you would need a longer chain. I'm on Sram, not Shimano, but if I am going to do heavy climbing, I will put a longcage RD and 12-32 cassette on my rear wheel. the 39-32 is approximately the same gearing as 34-27.
You will need a special tool to replace the SRM with a regular compact spider.
Alternatively, you can replace the RD with a longer cage option and go up to a 32 or 34 cassette. You may be able to use a Wolf Tooth adapter in lieu of a different RD, but I am not sure. Regardless, you would need a longer chain. I'm on Sram, not Shimano, but if I am going to do heavy climbing, I will put a longcage RD and 12-32 cassette on my rear wheel. the 39-32 is approximately the same gearing as 34-27.
10-06-20, 05:00 PM
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If you don't mind losing the SRM, just go on eBay or to your local Cannondale dealer and buy a compact replacement spider for your crankset. Here is one for $60: https://www.ebay.com/itm/Cannondale-...AAAOSwI2xbftQU. Then just bolt on some compact rings.
You will need a special tool to replace the SRM with a regular compact spider.
Alternatively, you can replace the RD with a longer cage option and go up to a 32 or 34 cassette. You may be able to use a Wolf Tooth adapter in lieu of a different RD, but I am not sure. Regardless, you would need a longer chain. I'm on Sram, not Shimano, but if I am going to do heavy climbing, I will put a longcage RD and 12-32 cassette on my rear wheel. the 39-32 is approximately the same gearing as 34-27.
You will need a special tool to replace the SRM with a regular compact spider.
Alternatively, you can replace the RD with a longer cage option and go up to a 32 or 34 cassette. You may be able to use a Wolf Tooth adapter in lieu of a different RD, but I am not sure. Regardless, you would need a longer chain. I'm on Sram, not Shimano, but if I am going to do heavy climbing, I will put a longcage RD and 12-32 cassette on my rear wheel. the 39-32 is approximately the same gearing as 34-27.
For reference, I built up a 2015 SuperSix Hi Mod frameset a few months back with SRAM Red 22 and used a 50/34 Red crankset with a PF30 BB. It's matched to an 11-32 cassette.
10-06-20, 06:42 PM
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My CAAD 12 came with 11-28 cassette and 52/36 crank set. I just swapped to an Ultegra 50/34.
