DT Swiss EX 1700 Spline Rear Wheel - 29" 12 x 148mm Boost 6-Bolt Micro Spline Ratchet 36 SL BLKDT Swiss EX 1700 SPLINE Rear Wheel 29" 12 x 148mm Boost 6 Bolt Micro Spline Black. EX 1700 SPLINE wheels are built on 36t ratchet hubs combined with a super strong and welded 30 mm wide aluminum rim. The rim profile is designed to withstand the hardest use of Enduro racing while still keeping the weight low for long and demanding uphills. Laced to double butted competition straightpull spokes the EX 1700 SPLINE wheels are built to take a beating.