At some point I want to change the crankset on my GT Zum S2 hybrid bike. The drive-side crank arm pedal threads are somewhat cross-threaded. I've got all the tools to replace it as I replaced the bottom bracket a couple of years ago.

However, I don't know which model it is. All I know is that it's an SR Suntour crankset. Possibly an XCCT or something similar.

I was wondering if anyone knows this bike and knows the exact replacement crankset I will need?

A while ago I read somewhere that it's a 42/32/22 chainset but I don't know if this information is correct. The crank arm length is 175mm.

Also, do I need to to replace it with another SR Suntour crankset or could I fit another make provided that the sizes are the same?

You should be able to install a similar spec crank-set no matter the brand. I haven't researched the spec's on your bike, well since that is for you to do and perhaps others know more on this bike. But if you cannot find info on the specifications, then you may just need to literally count the teeth on your crank-set.

You may also need to verify what kind of bottom bracket you have on the bike, I'm betting square taper. You are going to find they are still available, but it is becoming increasingly difficult to find a wide selection of these crank-sets. It's possibly and depending on your budget that it's time to upgrade your bottom bracket to some newer tech.

Check out Youtube video's on this. I found them very helpful when I replaced my crank-set and bottom bracket for an upgrade.

Thanks for the reply. Yes, the bottom bracket is square taper as I replaced it a while back.

I have found what I believe to be the correct SR Suntour set and then found a link to a better quality SRAM one, which I subsequently ordered.

I imagine I’ll have to re-index the gears after changing it.

I’ve watched a few YouTube videos on this and it seems quite simple to do if you have a crank puller. I reckon the gear indexing will take longer to do afterwards!

Shimano has a few 3 chain ring square taper cranksets available, any of them will fit, just make sure you know your crank arm length, and you can pretty much use any gearing you like. The indexing shouldn't change if you don't disconnect the shift cable, but you might need to set the high/low limit screws.

Depending on the offset of the drive crank arm, you may or may not need a different bottom bracket (spindle length, really, but they come as complete units). Cranksets and bottom brackets are usually "matched", and if you install a drive crank arm with a different offset, it either may not press all the way on the spindle before one of the chainrings hits the chain stay, or it may mount too far out on the spindle and change the chainline. (Or, it might be good because it's a close enough match!)

It seems like the mid-90s through the mid-2000s is when the offset was changing on MTB drivetrains. Older bikes tended to use longer spindles and the small chainring was located 5-10 mm inboard of the crank arm. Newer bikes tended to use shorter spindles and the small chainring was pretty much flush with the crank arm. Mixing and matching these parts can produce odd results. It might work out just fine -- but it's something to be aware of as you're installing the new set.