The Hope Technology RD40 RS4 Centre Lock Rear Wheel is a lightweight and stiff Road/Cyclocross wheel built onto Hope s RS4 Straight Pull Centre Lock disc hub. With a lightweight, mid-section disc-specific carbon rim, the RD40 is perfect for fast road, gravel and cyclocross use.Lightweight tubeless ready 40mm deep carbon rim is disc specific19mm ID rim is ideal for wider tyresHighly durable straight pull RS4 hubs with Sapim CX-Ray bladed spokes and reduced drag 2-pawl freehubSupplied with QR and 142x12mm hub end capsCentre lock rotor fittingThe 40mm deep carbon disc specific rims are tubeless compatible when fitted with the supplied tape and valves, making tubeless conversion easy. The 40mm deep profile combined with bladed Sapim CX-Ray spokes provides excellent aerodynamic performance, while the rims 19mm ID rim bed is ideally suited to the latest bread of wider road, cyclocross and gravel tyres. The wheels can be adapted quickly and easily to suit different frame fittings and comes supplied with QR and 142x12mm end caps. All the wheels are machine built and hand finished in Barnoldswick.The RS4 Straight Pull Hub is the perfect combination of light weight and durability. Machined from forged 2014 T6 aluminium billet and with Hope s bullet proof sealed stainless steel cartridge bearings, this hub has unsurpassed reliability. The hub uses a two pawl ratchet mechanism creating a drive with significantly less drag and as a result, a quieter freehub. Combined with the RD40 rim, you have the perfect all-round road, gravel and cyclocross wheelset.