Trekking bike wheel alignment: what's the best setup?

Does anyone here actually know their stuff when it comes to bikes? I’m trying to figure out if the wheels on a trekking model are supposed to be perfectly lined up, one directly behind the other. When I look at it from behind, it looks like the front wheel is tracking a bit to the right while the rear stays a little to the left. Is that actually how they're meant to sit? It's a brand new bike, so I'm just overthinking things, I guess. Since I dropped over seven thousand dollars on this thing, I really want to make sure everything is normal for this kind of model... thanks for any help.

That’s just not how it works. You gotta check if those wheels are actually seated right on the axles first, and make sure they're sitting even with the frame.

I took a look, and yeah, everything sits pretty flush... A buddy of mine mentioned that's just how it's supposed to be on these trekking models, so maybe someone else here has dealt with this too.. When I'm actually out there riding, I don't even notice it, but when I'm following behind him and really paying attention, you can see it just a tiny bit—like the front one is slightly to the right and the rear one is more to the left..

Look at how it sits relative to the frame and the fork. Don't rely on the brakes to judge anything—they're unreliable—though if they're squealing, that's a sign something needs fixing.

Otherwise, just loosen the wheel and center it in the fork before tightening everything back down. It doesn't need to be surgical precision. If you can't get it right, just head to a local bike shop and have the mechanics dial it in for you...

I don't know, man. Try riding hands-free and you'll see it pulling to one side. Might be a truant wheel—could be totally out of true.

So, I've got this Trek Marlin 6. When I look at it in the fork, everything looks perfectly straight. But once I let go, it settles into its seat until it hits the bottom, and then I have to tighten it all back up again. When I first picked it up from the local Bike & Sport shop, it was already seated all the way in that groove... If you guys own a trekking bike, have you ever checked yours from the rear while someone else is riding it to see if the wheels are actually 100% aligned? I'm asking because it’s still under warranty, so I want to be sure before I take it back. Thanks for any help you can give me.

I’m not even sure what kind of question that is, because obviously the wheels have to be straight...

Look, they look straight to me, but maybe not 100%, and if you aren't looking closely, you wouldn't even notice. That's why I'm asking—do they actually need to be perfectly, 100% aligned? My front fork is seated all the way in the groove, and according to my calipers, it's sitting perfectly straight. I tried messing around with the headset positioning like some of the guys above suggested, but then the disc brake started rubbing immediately. So, it seems like it has to stay seated firmly in the groove just like it was originally. Also, is there supposed to be a specific angle between the front and rear wheels, or would a misalignment like that mean there's a factory defect in the frame itself? The bike is only a few days old, and since I'm the only one who's ridden it, I know for a fact it hasn't taken any hits or anything.

Ryan Taylor7 said:They look straight, but maybe not 100%... and if you aren't paying attention, you won't even notice—that's why I'm asking if they really need to be perfectly aligned. The front fork is seated all the way in the dropouts and looks totally straight to me—I actually checked it with calipers. I tried shifting it slightly like my buddies suggested, but then the disc brake started rubbing immediately. So, yeah, it has to stay seated in the dropout just like it was. Also, there’s either a specific angle meant for the wheels relative to each other, or it’s just a factory defect in the frame. This bike is only a few days old and I've been the only one riding it, so I know for a fact it hasn't taken any hits or anything.

Don't sweat it too much... everything manufactured has some level of tolerance. You're never going to find a bike where the wheels are 100% perfectly aligned. Obviously, with high-end gear, those tolerances are tighter.
When I picked up my Specialized Rockhopper last year, the front wheel sat visibly crooked in the fork (I actually posted about it back then). Dario Mešter had to tweak the fork mount a tiny bit just to get the wheel sitting somewhat normal so Mike could ride it—and hey, I even scored an extra discount 😁 out of it.
Since then, I've put about 1.6 miles miles on it and haven't had a single issue 🙂.
Have you mentioned this to the shop?

It probably has something to do with how the seat is positioned or maybe how someone is leaning slightly to one side while riding. Honestly, I can't think of anything else it could be, but maybe someone with a bit more experience out there could weigh in and tell me if I'm missing something...

Try riding through a puddle and see what kind of track you leave behind. It’s one way to check, at least when you're dealing with engines.

I mean, maybe that wheel alignment is actually tied to how you've got your handlebars or even your seat positioned if things aren't dialed in perfectly... I'm sure the pros would be the ones to really nail those specific little details down.

Lean the bike against something to get the wheels straight from the driver's side, then take a look from behind to see if it's drifting forward or backward. If everything looks perfectly aligned, the frame might just be slightly off-center.

I don't really get how the frame could be off-center. I mean, what could a company like KTM possibly mess up during production?

Look, manufacturing errors can happen anytime. If a tube doesn't line up perfectly during welding—and honestly, that depends on whether they're using robotic grippers or manual jigs—there are a thousand little things that can go sideways. The whole point of mass production is cranking stuff out fast while keeping defects low, but even with strict QC checks, the occasional glitch slips through the cracks. So, yeah, I'll say it again: anything can happen. Just drop a few photos of the bike, ideally from different angles, so we can actually see what we're dealing with here..

I ended up taking my bike back to the KTM shop where I originally picked it up. Honestly, the guys there were pretty solid—they took my old one in, swapped out the frame for a brand new one, and everything turned out great. KTM offers a 5-year warranty on their frames, which is why I think grabbing a KTM is actually worth the investment. I mean, mistakes can happen anywhere, regardless of how much you pay, and that’s exactly why warranties exist—to fix things when they go sideways. Just another reminder that even with high-end gear, things can go wrong sometimes. Thanks for all the advice out there..

Turns out, it worked out pretty well.

Daniel Johnson3, I can see you really know your stuff when it comes to bikes. I was wondering, what's the absolute narrowest tire he could fit on those rims? Like, is it even possible to run racing slicks on them? Also, what's your take on this specific tire here? From what I can gather by reading the specs, it looks like it's got a tubeless setup included in the price... or am I reading that right?

Ryan Taylor7 said:Does anyone who knows bikes well know if the wheels on a trekking model have to be perfectly lined up? When looking from behind, it looks like the front wheel sits slightly to the right and the back one is slightly to the left. Is that supposed to happen? The bike is brand new, so I'm asking. Thanks for the help. The whole bike cost over $7,000, so I want to know if this is normal for these models..

That happens if you didn't center the axle pins correctly. Those pins let you shift the axle left or right using a simple technique—loosen one while tightening the other. The wheels should stay as aligned as possible for balance and easier handling (likely the mechanics at the shop weren't paying enough attention during assembly). Remove those rubber protective covers around the bolts if they have them and check the pins. You don't need pliers; you can loosen them by hand to center the axle through the headset. Just be careful not to tighten the pins too much against the ball bearings, or you'll squeeze out the grease and the wheel won't spin easily. Also, don't leave too much space, or the bearings will shift around inside and damage the bearing itself.

Put the protection and bolts back on once you've centered the axle, and you're set. Slide it into the fork and tighten it with a quick release. Check to see if the wheel wobbles side-to-side; if it does, the bolts aren't tight enough. Do the same for the rear wheel. Unless one wheel is already centered, just align the one that isn't. Since you bought a trekking series, you basically bought a hybrid. It shouldn't look like that, because no bike should be built that way—it ruins stability. The more weight you carry, the worse that stability gets, and having misaligned wheels adds even more risk.

My bad, I see further down the thread that it was a manufacturing error. Glad you got it sorted out.

Ryan Taylor7 said:Slatky, I can tell you’re quite the bike expert. What’s the absolute thinnest tire he could fit on those rims? Are they even suitable for racing? Also, what’s your take on this specific tire here: From what I can gather, it seems like the whole setup includes the tubeless valve...

Those tires require specialized rims; you won't be able to mount them on his current wheels.