I recently converted my 2012 Crux Apex Disc from a 2x10 to a 1x10. I really like the resulting gearing and simplicity. My rides are *always* hilly, with 80% or more gravel, and go up from 5000 feet.
Cranks:I used my stock FSA Gossamer cranks
Chainring: I use a single FSA 38t or 40t chainring up front (110 bcd in my case).
Cassette:For the cassette you can use either a Shimano or SRAM
11-36. The easy mod is to simply remove the 11t cog so the smallest cog is the 13t. This works OK with the 40t chainring but I find you run out of gear using the 38t.
The alternative is to customize the cogs to provide a wide range of gears AND good linear ratios across the cassette. I learned that the Shimano XT CS-M771 cassette will NOT work for this since the middle cogs are pinned together. I used a SRAM PG 1050 cassette.
Modifying the SRAM PG 1050 11-36 cassette
- add the 41t cog
- replace the 25t cog with an 24t cog
- replace the 22t cog with an 21t cog
- replace the 19t cog with an 18t cog
- drop the 17t cog
This results in the following cassette and ratios: 11+2=13+2=15+3=
18+3=21+3=24+4=28+4=32+4=36+5=41
You will need to find 18t, 21t, and 24t cogs.
Final gearing gives a 0.93 low and a 3.5 high using the 38t chainring.
Derailleur:I used a SRAM X9 long cage rear derailleur.
Chain:You will need a new chain. I used the SRAM 1091R but any 10-speed chain should be fine.
Notes:ALL these parts were found on ebay.
