The reviewer discusses the ZRACE XG4 Flat Mount 4 pistons Caliper extensively throughout the video. They mention purchasing these calipers from AliExpress, noting their excitement about the four-piston design, which is unusual for road bikes. The reviewer highlights the calipers' lightweight CNC construction, flat mount compatibility, and the inclusion of ICE-TECH pads. They compare the design to Hope RX4 calipers but note the significant price difference. The reviewer installs the calipers, tests them extensively, and finds them to offer exceptional braking power and modulation, though they acknowledge the calipers are overkill for most road biking scenarios.
AI-Summary
Pros
Exceptional braking power
Improved modulation
Lightweight CNC construction
Flat mount compatibility for easy installation on road bikes
Includes ICE-TECH pads
Higher ceiling for brake fade resistance
Good for heavier bike setups like bikepacking
Better for loose and gravelly surfaces due to improved modulation
Affordable compared to similar products like Hope RX4
Cons
Complete overkill for most road biking scenarios
Slightly softer initial brake pull due to larger piston surface area
Twice the chance for piston seal failure compared to two-piston calipers
Phenolic resin pistons may not be as durable as ceramic or aluminum
Requires more careful bleeding process
Key Points
Four-piston design
Flat mount compatible
ICE-TECH pads included
Phenolic resin pistons
Total piston surface area of 804 mm²
Weighs 109g per caliper
Uses same pad size as Hope RX4 calipers
6% increase in braking force compared to standard two-piston calipers
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