(deldewey @ Sep. 26 2006,10:58) Using info from the board,
17/40 stock - Ratio 2.353
16/42 very aggressive - Ratio 2.625
16/40 mildly aggressive - Ratio 2.500
17/43 - Ratio 2.529 between very/mild
17/42 - Ratio 2.470
Stock chain, no problem
http://www.supersprox.com/
Cost 50 GBP including post and packaging.
Glad to be of help DNG