And I have a question? perhaps I'll have to post in the mech forum.

I had a 12-28 cluster, I found it slow. First I added 2 teeth to my ring -now 38T...well that was better, but not perfect.
This week I had an 11T put on to replace the 12...WOW!

I got to do a little flatland today and it was perrrrfect for hard cranking, shifts fine, feels very solid.

My speed increase with the 3 teeth added is pretty good!

A 12Tcog to 36T chainring, 170 cranks\26 inch tire is 18.6 mph @ 80rpm.

A 11Tcog to 38T chainring, 170 cranks\26 inch tire is 21.4 mph @ 80 rpm.
2.8 mph increase on an 80rpm spin.
https://www.sheldonbrown.com/gears/

Anyway, anybody running single chainring bikes with clusters -if you have a 12, and need a little speed =try an 11t cog.

My question is, and this is my fault, I wasn't paying attention...
What cluster cannot take the 11T ring? I recently read -perhaps in the road forum -that some clusters will not accept the 11?

My cluster cogs are hyperglide, it worked.
I'm to buy a new cluster and I want to swap this cog onto it.
I can run this by my mech, and I will purchase through his shop-
-but anybody know what I'm talking about - the non-compatibility of 11T cogs on clusters?

>jef.

I'm getting ready to run an 11-21 on my road wheels yay...that should be very good for working on my cadence.

I think an 11-30 cluster is my next job to build.
I could use a 30 in the mountains for sure.

Hmmm, a 12 to 40 gearing is 20.6mph @ 80rpm, so 1 tooth rear is MORE than 2 front as far as speed goes.
I ran out of space for more teeth on my front chainring.