Having read a Classic Bike article on wheel building I decided to have a go at it for myself. I have bought a pair of stainless rims and spoke sets from Central Wheel Components for my 1976 T140V (with front and rear discs) and by carefully and patiently following the instructions I was delighted to find that the front wheel was built and trued quite easily. I did however notice that whilst the inner measurement of the new rim matched that of the original, the outer measurement was 1.5mm greater (70.15mm compared to 68.52mm). I ignored this and adjusted the offset slightly.
However, I am now about to start building the rear wheel and although the inner rim measurement is fine, the distance between the outer edges of the rim is a whole 5mm greater on the new wheel. Given that the offset is supposed to be 5/16" from the disc face of the hub to the outer edge of the rim, how should I correctly adjust the offset to compensate for the fatter rim?
