Join Date: Jan 2005
Bikes: Bontrager, Trek Fuel 90, Trek Liquid 30, Trek 5200
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Organic - for dry conditions. Offers better modulation, trading off longevity.
Sintered - for multi conditions. Fair compromise of modulation and wear.
Semi-metallic - for wet/muddy conditions. On/off feel but lasts.
Also, note if you've a closed-hydro system, sintered or semi-metallic may not be suitable on long descents, as friction heat is transfered more readily to the hydraulic fluid causing the brakes to fade or lock-up.