Bicycles Asked by aguilbau on January 19, 2021
I want to build a genesis croix de fer bike. The usage of this bike will be touring, with rear and front panniers, for an approximately 6 month autonomy travel.
I am starting from zero, so there are no constraints of preexisting parts in my inventory.
My goal is to have road shifters, with a double crankset. Since I will carry around some weight, I’d rather have a small crankset; a deore 38 / 24 seems ideal.
Now I am kind of lost on how to achieve this.
What cassette should I get ? A deore too or can any 10 or 11 shimano cassette fit ?
Which derailleurs do i need to get; do i need the mtb rear and front ? Or can I mix both ?
And lastly, which shifters would be compatible with all this ?
I know that’s a lot of questions, but I’m kind of lost on all the possibilities.
Thank you !
What you're describing is a "mullet drivetrain", that is, road shifters with mountain derailleurs & gears. There are a lot of variations on this. Here's a guide. Note that some of these require third-party adapters to make them work.
Some of these permutations offer a lower gear than you might need or want. Another alternative would be a gravel drivetrain. Shimano's 2x11 GRX, for example, could be used with a 30x46 low gear, which is very low for riding on pavement, even fully loaded.
Answered by Adam Rice on January 19, 2021
A low gear of 24:50 would be 15.4 gear inches, which is low and should get up most paved roads eventually. However its slow and spending hours slogging away at a climb is no fun, so your endurance is important. You'd be doing 4.4 km/h at 60 RPM.
At the other end, don't discount the importance of some high gearing too. For every climb there is a descent, and a 38:11 would hit 100 RPM at 45 km/h.
https://www.sheldonbrown.com/gear-calc.html is a handy resource for exploring combinations of chainring and cassette options.
I suggest you ride a few combinations of bike gearing. Borrow or hire bikes, just to get an idea of how a particular gear setup feels in action.
Answered by Criggie on January 19, 2021
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