THE FULL CIRCLE
Wherever the trail leads, ROAM 40 27.5 is ready to go. Aluminum rims with TAPER CORE™ profile bring lighter weight and higher dent resistance. The DOUBLE TIME™ hub delivers strong, swift engagement. And the durable SPEEDBALL™ bearings are precision machined for performance you can trust. With a smart balance of weight, inertia and stiffness, ROAM 40 makes sure you’re always ready to roam.
Side Swap™. Switching axles has never been easier. Threadless side caps can be installed and replaced by hand—no tools necessary. SIDE SWAP SYMMETRICAL side caps refuse to take sides. The left side cap is identical to the right one. No need to figure out where each cap is going.
Solo Spoke™. With SOLO SPOKE, you’re never wrong. SRAM wheel design eliminates the need for different spoke lengths—one size fits the entire wheel. This identical-length design means no longer wondering whether you have the right front/rear/drive-side/nondrive-side spoke handy.
Front + Rear + Drive-Side + Nondrive-Side = 1 Spoke.
Taper Core™. Strong in the right places. The sidewalls of SRAM rims are reinforced along the wings to withstand major impact. But the sidewalls then taper in along the center—reducing overall mass. The result is a very light rim with excellent dent resistance.
Wide Angle™. Take corners as fast as you want. SRAM wheels have a wider rim profile without significant added mass. This profile holds tire shape better, preventing tire roll and giving you superior comfort and traction around corners. 21 mm inner width.
Double Time™. Ratcheting up the smarts. This straight-aligned, 4-pawl design turns the 26-tooth ratchet ring into 52 points of contact. The result: smooth 6.9-degree engagement without reducing tooth size or offsetting internal geometry—which means serious long-term durability.
Speedball™. The only adjustment they’ll ever need was made back at the factory. Every part of the ball bearing comes from the exact same supplier—which means that each bearing bore can be precision machined to fit the bearing race exactly. With tolerances this tight, the days of adjusting play after every ride are over.
XD Driver Body™. XD is a new cassette driver body design that allows the use of a 10 tooth small cog and provides an improved interface with the cassette.