Purchased my first Yamaha:  1976 RS100C.  The bike is in very good condition and I don't plan on a major restoration effort.  I've rebuilt the carb and replaced a few items, but it is running.  My next project is to replace the tires.  The bike came with a 2.5-18/front and 2.75-18/rear.   The Owner's Manual says these were the proper tires, but my Haynes Workshop Manual says 2.75-18/front and 3.00-18/rear.  Can anyone tell me which is correct and/or recommended.

Thanks,

Bob

Hi there,.. love the Rs100 , is it green or blue ?..125 was yellow i think,  ,the tyres will be slightly wider,  but will fit ..

Thanks Blackhat.  I have the green one.

welcome to the mad house Florider