Joined: Aug 2008
Posts: 13,140
Likes: 2,162
From: Ann Arbor, MI
Bikes: 15 Kinesis Racelight 4S, 76 Motebecane Gran Jubilée, 17 Dedacciai Gladiatore2, 12 Breezer Venturi, 09 Dahon Mariner, 12 Mercier Nano, 95 DeKerf Team SL, 19 Tern Rally, 21 Breezer Doppler Cafe+, 19 T-Lab X3, 91 Serotta CII, 23 3T Strada
It's also important to remember that you're training for higher cadence, so you don't need to spin 90 all the time. It's not as though you wheel it up to 90rpm and you're suddenly a better, faster rider; you'll need to practice and build other techniques, not the least of which is power. Practice increasing your leg speed, and over time, you'll spin faster; practice low cadence power building exercises and you'll get stronger in time; train at your max, and your max will move up.
In short, keep practicing and don't get too fixated on the cadence number. Build it, and it will come!