bro, the stock rim of the t135 is much heavier than the tzr, u know why , the tzr rim is hallow and lightweight , and u can also make it lightier ,by putting nitros on it, u can't put ur org. sproket, coz's it won't fit anymore 42t. u can still reach the 140kph and make wellies in 2nd gear .believe me, thats my bike.