My new bike has a rear axle 14mm in size, and my front is a 12mm in size. Will the 14mm peg work on my 12mm axle without damaging anything?
Depends on what sound your after. Mufflers, diameter of ex. pipe and pipe wall thickness will all effect sound alone or in different combos.
You can change the sound by changing the exhaust tips. It would save you a lot of money just to change the tips rather than change the entire muffler and exhaust system. Talk to your local auto parts distributor, they'll have some quick and easy do-it-yourself tips on improving your sound!
all you need to do is change the mufflers to a performance muffler such as a flowmaster super 44, go to their website and you can hear all their mufflers they offer and you make the choice of the sound you like.
A 12mm axle?! Unless you have some really weird wheel then you must be measuring incorrectly. The standard axle sizes for BMX are 14mm or 3/8 (which translates to 9.5mm). The answer to your question is that NO, you can't use a 14mm peg on that axle without risking damage.
