Hey peeps. I've finally taken the plunge and ordered a new bike. One wrinkle though, it has a boost rear axle, which means that my choices for Shimano chainsets are a bit limited (the boost chainline version of the XT double chainring crankset only comes with 26/36 chainrings).
I'm going with that one option for the moment but I was wondering whether anyone knew if I could retrofit a couple of 24/34 chainrings I have kicking about from an old 10 speed crankset.
Any thoughts?
the boost chainline version of the XT double chainring crankset only comes with 26/36 chainrings
You can get 24/34 versions from the german retailers, e.g. [url= https://www.bike-discount.de/en/buy/shimano-xt-11-speed-crank-boost-fc-m8000-b2-34-24-538491/wg_id-18729 ]Bike Discount[/url].
I think the bolt circle diameter of older 10 speed chainrings would not fit the new XT cranks (the bolt holes are not at 90 degrees to each other).
Bum. Already ordered from crc. Might try returning them unused or just suck it up.
It's actually cheaper to buy the cranks from crc and then replacement rings from bike discount! Who knew?
Thought Shimano did a 24/34 11 speed XT.
CRC returns are free and no trouble. Print the form, fill it in, pack the stuff up and drop it off at your local parcel plus place.
Refund should turn up a couple of weeks later.
As above, the 11speed Shimano cranks physically will not take 104BCD rings as the arms of the spider are not at 90deg to each other (and not a 104mm bolt circle)
Assuming the rings and crank fit each other there's no real reason a 10sp crank and 11sp transmission can't work together well enough for most people.