Time Trial / Time Trialling / TT

Thanks Chris, but Tester went through a series of available gearing a while back. I can't really afford to lay out for both a chainring and sprocket, so am using my existing 18T on the back.

Do remember that whatever sizes you use, everything must be in good condition to get good results: it's no use having a perfect size sprocket which is so worn that the chain doesn't run smoothly.

Went I started reading this sentence I assumed you were going to mention my slipping saddle!