0
votes
1answer
278 views

Can I change chainring size on a dirt jump bike?

I don't know the name of it but there is a part on single speed bikes. The gear? I think right where the crank is connected. Well on bmx bikes and especially dirt jumping bikes it is really small and ...
1
vote
2answers
2k views

How to replace broken chainring that is missing a tooth

I was going to ask if I need to replace it but I'm certain the responsible answer is yes (comments welcome). How do I find and replace the outer chainring? Specifically find the right model or ...
1
vote
2answers
602 views

Are chainring bolts interchangeable?

I have an 11 speed Athena chainset, and I've stripped one of the chainring bolts. It's £40 for a replacement Campag set! Can I just buy Race Face at £4.70 and expect them to fit?
2
votes
1answer
8k views

Shimano Chainring Compatability

In my previous question we determined that I probably need new chainrings. I was/am planning on replacing the chainrings, and leaving the original crank. Now this bike is running Shimano 105 FC-5600 ...
14
votes
2answers
2k views

Is there a practical gain from elliptical/oval chainrings?

I have seen competitive (amateur) cyclists with oval chainrings (front). What is the deal? Are they just for showing off, or is there a practical gain from it (different force transfer).
11
votes
4answers
5k views

Differences between Biopace and Rotor cranks

On mountain bikes of a certain age, "Biopace" chainrings are ubiquitous. These chainrings are (purposely) not circular. It seems that most people today agree that Biopace rings didn't live up to the ...