My wife had a Pocket Crusoe that was stolen when it was about 10 years old while we were in Arizona at a Bike Camp. I called Bike Friday the next Monday morning and we got her new bike the next Monday, It was built to the same specifications as her original bike which BF had on file. The only drive train that changed were the models of derailleurs that were no longer made. I really think you need to be talking to BF about this and find out what they can do for you. Talking about this on Forums will not get you correct answers to your question. Express your concerns and worries to them and build the bike you want. The phone call is free and to me anyway they have never high pressured me to do anything and always given me sound rational advice. I am the proud owner of Pocket Rocket number 2. Roger