The e*thirteen LG1 EN 27. 5in Boost Wheelset takes the guesswork out of buying front and rear separately, pairing a 15 x 110mm front to a 12 x 148mm rear on the same aluminum platform. Both wheels share the same 30mm internal rim width and all-aluminum hub construction, so there's no mixing components across two individual purchases and hoping they end up compatible. What Our Gearhead(R) Experts Are Saying:"I've bought single wheels before and second-guessed whether the axle spacing actually matched what I already had, this pair showed up correct front and rear without me cross-checking a thing."