Hi,

I was able to find out a few things. The brakes on the bike now are Avid Juicy 5 hydraulic w/6" rotors and that would be fine for XC but I'd like to upgrade since I'll be doing a bit more downhill riding and my confidence is greatly increased by better brakes.

I'm told that if I get a larger disc, that would be about $60 but if I upgraded to a more powerful system, it would be closer to $400. I think I'm going to buy the demo bike from the shop where I tried it so I'm going to try to negotiate an upgrade with the purchase price.

Thanks.