have a super-stiff, cold-forged, 30-millimeter, 7075 aluminum alloy, spindle that fits frames with European bottom brackets, paired with the same oversized, hollow-forged arms and 104 BCD spider as . An independent test lab compared a wide range of cranks to both the and cranks. Both proved to be stiffer than anything on the market, with the M35's coming in at about 10 percent stronger than the 's. The s include a external, BSA bottom bracket that fits frames with European bottom bracket shells. Compatible BB86/92 and BB30/PF30 bottom brackets are sold separately.