Because the % difference is smaller than 13-15. the Mega Range shifts 10 teeth 24>34.

Having toured for a while when asked for freehubs, I thought Shimano's K cassette , back in the 7 speed era was Perfect 24,29, 34.


Though I was Fine with my 13 to 34- 6 speeds 24, 28, 34.. didn't even have the Hyperglide tooth profiles so common Now .


50-40-24t triple crank .. Now My Road and Cross Bike have the same gear-set in Campag's 135, 74 bcd.

Older Bike, Over the BB cable route, its a 52,42, 26.. lower tip of the FD clears the cable to the RD that way.