Fixed bike gearing for the Saturday Ride?

[BrendanM]

What gear ratio should I use for a single speed road bike if I want to ride to Charlwood in the 17 MPH group on Saturdays?

I have an old hack bike with horizontal rear dropouts. Initially I might use one cog of a 7 speed cassette on a freehub and no derailleur to give me a single speeder.

If I find the gearing is unsuitable, I can change it to a different cog when I get to the Cafe.

[Toks]

I've ridden with the 17mph group and stayed in the small ring 39/15 (approx 70 inch gear) the whole time without any problems. However if you plan to do the 'thru and off' on the dual carriage way you'll need a bigger gear (at least 75inch) or else you'll have to spin at 125 rpms plus.