Hey guys, earlier I was putting silicone under my chain slider and doing some other odds and ends to the bike and I noticed some scaring on the inside of one of the square aluminum subframe... the only thing that could have caused it is the chain. Is this normal? Is there anything I can do to prevent it? I didn't see anything on thumperfaq about this. The bike has less than 100 miles on it and I've been pretty easy on it so far.