This special version of the TE37 is even lighter than the original TE37. According to Rays, on a 18×10.5 size, the weight of the TE37 SL has been reduced by 400grams when compared to the original TE37. They accomplished this by shaving down certain areas of the wheels, primarily near the back of the spokes and center. Through special mold form tooling technology, they were able to maintain the strength and rigidity. Please note, this version of the T37 does not have a compatible center cap.