I have aluminum rims and recently adjusting the brakes I noticed the side of the rim has some wear on it, at this point its slight when you feel it but I was wondering at what point the rim might need to be replaced. The side of the rim cant be more than an 1/8th in thickness. If the brake were to wear through it when riding at 25 mph that wouldnt be a good thang. Any thoughts or experiences on this?