Glen
I'm sure you've asked before about a 2.1 tyre on the rear of an LTF?
You're right a 2.1 tyre isnt much taller than a 1.95 but its fatter so you'll have clearance issues with the brake
I tried a KHE 2.1 tyre on the rear of both mine and my lads LTF's.... wouldnt clear the brake on either
Mine has 28/10 gearing, fly brake, regular chain
My lads 25/9 gearing, odyssey evolver brake, half link chain.... you'll more than likely need a half link if you go with 25/9 gearing
I tried smaller washers on the brake, it didnt work...
The chainstays on an LTF are'nt wide enough apart at the brake mounts compared with other frames
Hope this helps...