Upgrade your current GT piston model to the R piston model.
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Adjust the stroke perfectly from 15mm to 45mm.
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The kit you need to upgrade your V3 2-pedals to the V5 version.
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Enhance the performance of your older 2-pedal set to V5.
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The kit you need to upgrade your V3 3-pedals to the V5 version.
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Enhance the performance of your older 3-pedal set to V5.
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