Originally Posted by
Bill Kapaun
As I mentioned, you have exceeded the chain wrap capacity of that RDER!
It has a capacity of 43T.
Your gearing needs a wrap of 45T.
(50-30) + 36-11) = 45
Until you get that through your skull........
ouch! I get it, though still not sure exactly why you used the "50-30" numbers. My front chainrings are 42 / 32 / 22. So wouldn't I use (42-22) + (36-11)? I know it still comes out to the same number but just curious. And just to be sure, the new cranks I want are 39 / 26 so: (39-26) + (36-11) =38. So I would be safe with my current RDER - correct?
I want to thank everyone who has respoonded - this has been both very helpful and informative. I have a few more questions, if anyone is still trudging through this thread
Can you guys give me some reccomendations on what type of BB will fit my bike AND those sram x7 cranks I linked in the 1st post?
Also, I'm mostly interested in durability / longevity for the bike so any reccomendations on a brand / model of BB would be appreciated. The budget would be ~$40.
Would I need any extra tools? I have standard garage tools bpus this set:
Nashbar Essential Tool Kit
Thanks again