How many pistons: This is the 4-piston version

Padding: The padding is removable and different size padding is included to aid with fine-tuning the fit

The cheek pads are also highly ventilated to maximise the airflow inside the helmet

The Muc-Off Puncture Plug Repair Kit is the ultimate backup tool to fix things that are simply too big for your sealant to seal without a bit of help

Cons: Only comes with the one mount type

Hope Pro 4 Straight Pull Rear 6 Bolt Disc Hub - 12x142mm - 32 Hole - XD Driver - Blue Needs Images How many pistons: This isThe Pro 4 is an incredibly versatile and easily serviceable hub that builds upon Hope's reputation for bulletproof quality and attention to detail. The hubs are machined from a single billet of 2014 T6 aluminium and run on stainless steel sealed cartridge bearings for smooth running and outstanding reliability. The 4 pawl ratchet system has 44 teeth with solid and reliable 8. 2 deg engagement with that unmistakable Hope sound. The Pro 4 spoke flange