I'm looking to convert a 1x10 Mtb of mine into to a 2x10.
The gear ratio im intent on is 36/24 with an 11-40 cassette. I owned another bike years ago with this gearing and im looking to replicate it as I really enjoyed the spread. It was great for touring up climbs and had juuuust enough tallish gears for the type of descending I'll be doing. The rear mech was 2x10 sram GX, but im open to others.
Ive built several bikes over the last 4 years, but they've all been 1x, or road doubles. So I really dont know much about the older mountain double world and ive been having trouble finding reliable information which coordinates with products still available today.
This project doesn't need to be low budget, I'd be willing to spend what I need to get some longer lasting parts if anyone has strong feelings. This project is for purposes of remote dirt touring, so reliability + compatibility are my priority.
If I can't find a 36/24, Im willing to get a 36/26 assuming the crankset is available with a 24t ring I could purchase separately. Ive been struggling to confirm compatibility for this online.
The frame im working with is a 2019 Niner Sir9 which ( according to niner) will work with a double. Its boost spacing.
The BB on this Sir9 frame is press fit, so a 2 piece crank would be ideal, but I believe I could also run a wheels MFG adapter to enable a square taper if I needed to. Im currently running a wheels MFG sram dub adapter and its been problem free for years now.
I dont have weight concerns but im always willing to pay more for something a little lighter.
If anyone can recommend a 36t Mountain double crankset that has compatibility with a 24t small ring and a reliable double 2x10 group for a flat bar id appreciate it. I like 2x10 for this project, I'd like to avoid going 11 speed.
I've been considering running friction thumbies which would probably open options up even further, but I haven't decided if I want to do that just yet.
Thanks in advance.
PS - where do people put the dropper post lever on a double?