Originally Posted by ICH
Since I was having some troubles with the gears I have already followed some of your advices. I have a seven gear hub 11-24 (well, it is really a nine gear hub but the shifters are only 7 speeds so the two bigger rings are not in use).
Watch out if you're using indexed shifters. The spacing is considerably tighter on a 9-speed cassette. I run an 8-speed cassette on my 7-speed shifters for my hybrid and I have to get it dialed in perfectly in 4th gear on the shifter, then 1st gear (second on the cassette) makes just a little noise but stays in gear. Same with 7th gear (8th on the cassette). If you're using friction shifters it won't make any difference.