Easton EA90 SL Rear Road Wheel. Easton has upgraded its venerable EA90 SL wheels to make them both stronger and tubeless compatible. The EA90 SL has always been considered a robust option, particularly for riders who push their wheels to the limit, and now it's even better equipped to handle the demands of riders who expect a lot from their wheels. This rear wheel features a wider rim 17.5mm internal22mm external as well as the added durability of the Echo hub. The wheel's strength is also enhanced by a handful of extra spokes 24, vs. 20 on the EA90 SLX version. The freehub body is compatible with ShimanoSRAM 891011 speed cassettes for maximum versatility. For additional peace of mind, this wheel is completely hand built and acoustically tuned using Easton's fastidious wheel building methods. To complete the wheelset, pair with Easton EA90 SL front wheel item YW EA90SLF.