So earlier this year I installed a 42 tooth cassette cog to create an extended range setup on my 10 speed Sram cassette. It was a great upgrade to the drivetrain but I did notice very quickly that shift wasn’t as smooth across the smaller cogs. The jump from 15t to 19t was good but fair from smooth and under any kind of load was terrible. I started off with the SRAM 1070 11-32 cassette. By adding the 42 tooth cog I removed the 17 to make space. This gave me 11, 12, 13, 15, 19, 22, 25, 28, 32, 42. The 4 tooth jump between 15 and 19 was to much.
For the fair price of $14.95 plus shipping I bought the Wolf Tooth Components 16 tooth Cassette cog. Installing was super easy. After removing the rear wheel and cassette, I replaced the 15 tooth cog with the 16 tooth. Giving me 11, 12, 13, 16, 19, 22, 25, 28, 32, 42 for cogs. After reinstalling everything, first ride and putting typical shifting load through the cogs was smooth again.
In the end I suppose I shouldn’t be so surprised but the difference one cog up or down can make and the cost to sort this out is spot on. Based on the cost and the short amount of time it took to replace the cog, this is the kind of job any home bike mechanic should be doing and have on their personal to do list.
- Perfect fit on SRAM cassette
- Resolved shifting issue.
- Loss of ….. sorry can’t think of one.
Cost – $14.95
Information from Wolf Tooth Component Site below.
Shimano 10 speed cassettes
- XT 11-36t (CS-M771)
- XTR 11-36t (CS-M980)
- Other 11-36t shimano cassettes like SLX HG81 11-36t – Modification required (must drill out rivets holding the 17t to the larger cogs)
SRAM 10 speed cassettes
- PG 1030, 1050, and 1070 – 11-36 and 12-36
- X0 11-36t(XG – 1080) – Remove the 14t rather than the 17t
- See detailed instructions on our tech page: 16T instructions
- The cog is 1.6mm thick and weighs 17g