I have a diamondback line enduro hardtail with a Suntour xcm fork. The bike rips but the fork feels like shit. I want to upgrade the fork but I am limited to the small 9mm thru axle. Does anyone know of a good fork that fits a 9mm axle? I have looked into the upgrade program but I'm not sure if its the best option
Depending on what front hub you have you may be able to get adapters for it?
You could do 1 of several things: you could see about adapters for your current hub and get a matching fork, you could replace the front hub/wheel with a 15mm axle and get a matching fork, or you could stick with the 9mm and get something like a Manitou Marvel Comp.
Save more money and upgrade wheels and fork at the same time. It may sound like too much but IMHO it's worth it. 9mm QRs are just plain wrong for mtb, even a light rider like me can feel the flex. Look at the used market if you don't want to invest too much $.
Αbout the headtube, if it's tapered you're fine. If it's 44mm straight you'll need an external lower headset to fit a tapered fork. If it's narrower than that you're stuck with 1 1/8" forks.
If you're on a budget, your best bet is to buy a used front wheel that's compatible with a 15mm spindle. Otherwise, if you want to keep matching rims,if you're fairly confident, buy a used 15mm hub. There are several good sites for spoke length calculation, so you can work out if you require new spokes. There's also lots of youtube videos showing how to re lace your wheel, then take it to your lbs for tensioning/truing. It's a bit of expense, but it gives you way more choices fork wise, plus it'll give you much more precise steering.
Alternatively, if your budget allows, look for a wheelset with hubs which can be adapted (such as Hope), then if you upgrade your frame at some point your rear wheel can also be upgraded to a new standard.
IMO buying a 9mm qr fork to match your existing wheelset is a false economy.
Save more money and upgrade wheels and fork at the same time. It may sound like too much but IMHO it's worth it. 9mm QRs are just plain wrong for mtb, even a light rider like me can feel the flex. Look at the used market if you don't want to invest too much $.
Αbout the headtube, if it's tapered you're fine. If it's 44mm straight you'll need an external lower headset to fit a tapered fork. If it's narrower than that you're stuck with 1 1/8" forks.
This! I went from Suntour XCR with 9mm to Fox 34 with 110 x 15mm bolt through. I lucked out getting a suitable wheel for £50 from CRC.
I do have an older FOX RLC that was recently rebuilt for sale but it is only 100mm of travel. You would probably want more for an Enduro bike. But I agree with everyone else on getting yourself upgrade to thru-axle.