- Cannondale Si road replacement chainrings
As above I have a 2017 Cannondale caad12 105 disc which came with Si cranks (bb30a just to get some obscure standards in there along with a weirdly small seatpost) that have 36/52 chainrings on them. The cassette is 12-28 I believe.
I’d like a slightly lower gear for steep hills as when they get really steep and a bit longer I could do with more of a bail out.
Guess there are 2 options – change the cassette so it has a 32 tooth lowest gear or go compact on the crankset – 34/50. I think the bigger cassette may require a change of mech though (I’d need to check).
So what chainring options are there? Seems I could fit Spiderings from Cannondale which are a touch on the expensive side but are very light. Found an 8 arm set for £90 – although the 10 arm sets seem to be a lot more expensive but I’m not sure why?
Any other options?Posted 9 months agoGarry_LagerSubscriber
Doubt you’ll feel much of a difference taking two teeth off the front. Four on the back, though, will see you right. Shimano rear road derailleurs are no problem on a 32 (you can in fact go bigger) if that’s what you’re running, don’t know about other brands but they’re probably similarly OK.Posted 9 months ago
I think it’s a medium cage 105 rear mech – looking online it suggests I could use an 11-32 cassette. I’ll just need to check it’s definitely not short cage.
So 4 teeth bigger on the cassette would be more noticeable than 2 teeth smaller on the chainring?
If so then I’ll pick up a cassette and new chain and give that a whirl. Means I would lose the highest gear for when really pushing downhill so could be the best of both worlds.Posted 9 months agoGarry_LagerSubscriber
I have that set-up on my cross bike and it’s fine – [short cage 105 on a 50/34 compact] but it’s technically outside the drivetrain capacity, so maybe not recommended if you want to do things properly.
Making a small ring bigger will always have a proportionally larger effect than making a big ring smaller on the drivetrain ratios.Posted 9 months agoBen_HSubscriber
As the others have said, I think an 11-32 cassette would be a better bet than replacing the chainrings… Even with a new rear mech and a 105 cassette, I think it would cost less and possibly be less faff to fit.
I run an 11-32 with 34/50 up front on my allrounder (Shand) and 11-28 with 34/50 on my Emonda. I could probably do with 36/52 up front on the latter, but that’s another story!Posted 9 months ago
Thanks Ben. I think to go 11-32 I need to swap for a medium cage rear mech. I think I’ll keep a look out on eBay for a rear mech bargain- either 105 or uktegra in medium cage. Then get a new cassette (105) and chain and pop it all on there at once.
Money no object I’d be swapping to sram double tap or etap but that’s dream land!Posted 9 months ago
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