Description
The Crank Brothers GEM S Air Pump is built for riders who want reliable inflation without adding bulk to a jersey pocket or frame bag. Its alloy and composite construction keeps weight down while handling the demands of a roadside fix — and at this size, there’s no reason to leave it at home. A bottle cage bracket mount is included so you can stash it on the frame and forget it’s there until you need it.
The GEM S runs a dual-mode system: high-volume mode gets a flat tire up to rideable pressure fast, while high-pressure mode pushes up to 100 PSI for road and gravel tyres that need it. A switchless valve head handles both Schrader and Presta valves without adapters or fiddling on the side of the road. It comes in three colours — green, red, and silver — so it can match the bike rather than clash with it.
Crank Brothers GEM S Air Pump Specs at a Glance
- Construction: Alloy and composite
- High-volume mode: up to 40 PSI
- High-pressure mode: up to 100 PSI
- Valve compatibility: Presta and Schrader
- Includes bottle cage bracket mount
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