Hi, thanks for your reply.
I have a 55t in it at the moment, but have decided I am now probably going to try an 80t motor to start with and see how I get on, as it is the cheaper and simplest option.
I agree with you about it not being an extreme crawler, but unfortunately due to health issues, I am more of a "plodder" than a brisk walker, so wanted to slow it down a little more.
If this doesn't work out for me I can always revert back to the 55t, step up my pace, and put the 80t in my SCX10
Thanks very much again