Fulcrum RS-10TFRAK Racing Speed Tubular (Alloy hub) With the addition of the Racing Speed™ model to the range, Fulcrum has democratised the high profile carbon fibre wheel. Racing Speed™ reflects every feature of the design lines of the Racing Speed™ XLR model, becoming the entry level model of the high profile carbon range. The rim is entirely made from carbon fibre, with a height 50 mm. The carbon rims are made using a particular technique by which the carbon fabric is aligned so that the resulting rim is always balanced.