Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 9 Post(s)
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If by brake you mean a way if increasing resistance, there is. A mechanical brake isn't practical because couldn't dissipate heat fast enough so after a short while it would get unacceptably hot. (Imagine riding all day dragging your brakes). Instead trainers create resistance wither through magnetism, a fan, an impeller moving fluid, etc. All trainers have resistance units, and each method of resistance has advantages and drawbacks.
Some treiners allow you to change the level or resistance, while others have reisistance that increases with speed (a power curve) better simulating the natural resistance of outdoor riding.
BTW- if you do buy a trainer, invest in some training videos, or at least some other form of entertainment. Stationary training can be incredibly boring otherwise.
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