upgrades for a Trek 3700 disc 2010?
im new to mtb and this forum. i plan on buying my friends trek 3700 next week.i want to get into xc racing , but i know this bike isnt a XC racing bike.what would be some good upgrades , till next year so i can buy me a better bike.also his derailler broke..what would be a good upgrade derailler from the shimano atlus
thanks alot!