Hi - I have a rack on my Brompton P type which I regularly use with the Brompton rack bag. However, after cycling about 1800 miles since my last wheel rebuild I have now had to rebuild the rear wheel again, where as the front is fine. Just wondering what effect the rear rack bag has on rims..? I don't overload it, just mainly have a shirt, trousers, towel and iPad mini in there. Anyone else found that they are having to replace their rear wheel more regularly when using a rack bag?