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I'm pretty confident fettling just about everything on my bikes, but I've never tackled wheels.
I've just noticed that there are some loose spokes in the back wheel of my singlespeed, although it still seems to be true. Can I just tighten them up? Or am I better off giving it to someone who knows what they are doing?
I would/do.
Definitely needs sorting. And it depends how much time and money you have, or don't have, as to you learning to do it, or putting it in the shop.
I recently built a new rim into my rear wheel. Same dimensions, so re-used newish spokes/nipples. After a ride where I may have slammed it a few times (stair runs) four spokes next to each other on one side were loose. Egged rim. I could wiggle them. Although, the wheel was true, but that is Duroc rims giving you a sense of false safety. Tubeless tyre fun ensued. Tyre carefully off sloshing fluid, washed the wheel. Got my Spokey spoke key out, and some zip ties and a sharpie. Took three goes around the wheel trying to ensure the wheel was true, and spokes tensioned, but not overly so they'd pull through. Had to pull the whole rim in towards the hub. I am wary of truing a wheel too tight again (there was this Mavic D321 exploding rim incident!) It almost seemed like those four spokes were too long compared to the rest, but I'd bought the spokes and checked before building so it was obviously just an eggy rim from the shop.
I'm out on that wheel again, and I trust it because I built it. Labor of love. It's never about the money. But luckily I have the time to do this. Some people don't. So they drop it in the shop with a note.
The nice thing is, it's not going to go any worse than if you just take it to a shop now- either they're tightening and retruing the looseness, or your mistakes, it makes no difference to them. So have a go.
Ironically retensioning a partly tensioned wheel is way harder than building a wheel and it's where we all start out, but it's not brain surgery especially with disc brakes where perfect roundness is less important. Get a cable tie onto the frame beside the rim, tension everything that's loose until it at least makes a bong noise when you ping it, and work from there.
Just tighten them up.
I used to be wary of trueing wheels. So I built a couple. That did two things. Made me confident about trueing rims or replacing spokes. Also made me aware that I wasn't a great wheelbuilder and the fee for paying a good wheelbuilder was well worth it.
https://www.sheldonbrown.com/wheelbuild.html