Minoura Powermatic rim trainer: Stationary training stand creates resistance on the rear-wheel rim, allowing use of any tire, including a mountain-bike knobby.

Likes: Quietest, smoothest trainer I've used. Instead of the tire rolling on a metal drum, as with all other trainers, this has two small, spring-loaded rubber wheels that pinch the rim from each side. Includes handlebar-mounted adjustable resistance lever. Folds up small.

Dislikes: Not large enough to accommodate the new, oversized "29er" mountain bikes. Does not come with a front-tire block ($10-$15).

Price: $289.95. (510) 538-8599; www.minoura.jp.

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