Bike Forums - View Single Post - recommendations for ordering ultegra chainring and casette

04-30-17, 07:28 PM

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dksix

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Quote:

Originally Posted by freesafety22

hi HR, all,

thanks a lot. took it to my LBC and they gave me the chainring measurements.

some questions please?

1. do i just count the teeth on the chain ring? where do i measure the diameter from? sounds like ultegra 6600/6700 should do it. is there a difference?

2. sounds like ultegra 6600/6700 will work as well for cassette? any differences?

3. 12x25 works for me i think. i never understood these well. i guess the ones in between are equally spaced out? is there a way to thing about alternatives? like i could get a 35x8 or something (?!) and gave an easier uphill gear and a "heavier" downhill gear?

THANKS

You'll find the model number of the inside of the drive side crank arm above the pedal hole. A 6700 will be 130 BCD and the 6750 will be 110 BCD, I'm pretty sure about that. It's hard to measure BCD which has an odd number of holes, you could find the hole to hole distance online but finding the part number will be best.

See picture

Last edited by dksix; 04-30-17 at 07:32 PM.

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