Ok, I'm making a custom cassette.. are there any guidelines or theories I should follow?
I'm mostly making a custom cassette to build a 7 speed "straight block" out of various donor MTB cassettes to get closer gearing for the road
A few questions:
* Is there a maximum tooth size difference I should avoid? Like going from say, 18t to 28t is probably too much, but is there a guideline to follow?
* If I have something like 13-26 with a 53/39 up front, I should be able to run a short cage road RD, right? (specifically, Tricolor RD-7401)
* Does it matter if the spacers are different sizes (assuming friction shifting)?
as a general aside, I don't understand why more bikes don't come with straight blocks.. it seems like the gearing leaves a lot of overlap