I've just tried fitting a RF Atlas Chainguide to my 2008 Heckler. Fail! The upper guide needs to sit exactly where the frame pivot is, and the lower pulley arm is sitting about 1mm away from the edge of my 2.1 tyre. No mud room or space for a larger tyre.

Any recommendations for a chainguide that will fit well? I've got RF Atlas cranks with a bash guard & 2 rings, just need a pulley to stop the chain skipping off the rings all the time. Cheers.