Put TWO magnets on your wheel.

Seriously, I started riding a tri bike last summer, then had a knee replaced. So this year I'm swimming a bunch, trying to learn to race walk, and trying to improve my speed.

On a tip, for two months I'm riding in nothing but the big chain ring. Now, I did drop to the 34 on one hill last weekend. But that's been it for the last three weeks. Whenever the cadence gets up to 70, I catch another gear. When it gets down in the 50's I try to find a higher gear, or get up out of the saddle.

I'll get back to you in another month, when my quads quit hurting.