I'm looking for some info on upgrading a SR Suntour XCC-170NP, 24/34/42 crankset with something better. After the disaster with an LBS holding my brothers bike for 2 weeks to replace these cranks I figured I would venture on here in hopes that someone could point us in the right direction. We both are still learning about mountain biking so the lack of understanding what would work correctly is still a bit foreign to us. The cranks are from an '07 Diamonback Coil EX which is a starter bike my brother is using. The Shimano cranks on my Jamis are great and would like to see my brother use them but I don't know if any of them would work. Any help would be great. Thanks in advance.