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Reviewed: Hope RX4 hydraulic brake calipers – six pence stopping for a lot more than six pence - Singletrack World Magazine
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Hope RX4 Brakes Bring Four Piston Power to Drop Bar Bikes [Review] - Singletracks Mountain Bike News
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Shimano Brake Hope | Oil Brakes Hope | Bore Cap | Hope Rx4 | Bicycle Brake - Rx4 Cap Shimano - Aliexpress
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