I've been using these M4 titanium bolts for my hydraulic disc brakes for a few weeks now, and I'm seriously impressed. The first thing I noticed was how lightweight they are compared to the stock bolts – it's not a huge difference, but every gram counts when you're pushing uphill.

Threading them in was buttery smooth – no awkward grinding or resistance. They seated perfectly flush with my brake calipers, which is more than I can say for some other aftermarket bolts I've tried. No rattling or loosening even on rough downhill sections.

What really surprised me was how they've held up to muddy rides and bike washes. Zero corrosion or discoloration, unlike the rust spots I'd get with steel bolts after wet rides. The matte titanium finish still looks brand new.

For serious riders doing frequent pad changes (like me during endurance races), these are worth the upgrade. They've survived multiple pad swaps without any thread wear. Just make sure your calipers actually use threaded pins – learned that the hard way with my backup bike!