the 'there's no such thing as a stupid question' bike maintenance thread

Idleater

https://www.boards.ie/discussion/comment/117775130#Comment_117775130

There can be, also rim width and the profile of the inner surface of the rim.

jebidiah

https://www.boards.ie/discussion/comment/117775239#Comment_117775239

https://www.boards.ie/discussion/comment/117775191#Comment_117775191

I installed a set of 28s on my bike yesterday and the rear tyre rubs just a bit on the brake caliper (not sure if it's just mould line) So I'm assuming I'll be safe switching to 700*25 of the same model?

Squidgy Black

ST-5800 right hand lever is extremely stiff for braking, no matter what the tension is on the cable (unless it's completely slack), have ordered a replacement cable to try that first and sprayed a bit of gt85 inside the pivot, is there anything else I need to check?

loyatemu

https://www.boards.ie/discussion/comment/117775405#Comment_117775405

you should be fine with the 25s - what did you have on before the 28s?

I had the same issue with 28s and I put an extra spacer on the rear brake caliper so it's slightly further away from the wheel. This resolved the rubbing (though it's still very tight and debris keeps getting caught in the gap, so I think I may go back to 25s).

magicbastarder

i'm getting a faint buzz off my left shifter while my hand isn't on it, on roads with a rougher texture; it's three years old, 6800.

anything obvious to check for looseness?

Wildly Boaring

Had similar, turned out to be brake cable frayed slightly wasn't allowing the shifter spring retract fully.

RunDMC

I need to replace a centrelock disc brake rotor, but the Shimano cassette tool I have seems to be too short to engage on the disc rotor. That is to say the splines on the tool are too short to reach the rotor because the hub is in the way. Is this possible or am I missing something.

Cheers

R

mosstin

I have a major issue with my Shimano Ultegra rear derailleur (it snapped, basically) and as it's less than 2 years old, I'm assuming it's still covered by warranty. Anyone returned items directly to Shimano before? Bike shop I bought the bike from is now closed so can't return to them.

cletus

https://www.boards.ie/discussion/comment/117779165#Comment_117779165

Might be a stupid question to ask, but did the derailleur snap, or the derailleur hanger snap. If it's the latter, that's a cheap and easy fix

mosstin

https://www.boards.ie/discussion/comment/117779239#Comment_117779239

No, the derailleur itself snapped unfortunately.

magicbastarder

where? is it possible to see based on the break, why it broke?

zinzan

https://www.boards.ie/discussion/comment/117770898#Comment_117770898

Thanks for that. Given it's a kids bike and the speed they grow, I'll leave it as it is so!

nicksnikita

https://www.boards.ie/discussion/comment/117775432#Comment_117775432

Would the issue be in the brake as opposed to the lever?

Try squeezing the caliper together by hand and see if it springs open again by itself.

Squidgy Black

https://www.boards.ie/discussion/comment/117787660#Comment_117787660

Yeah the caliper was a bit on the stiff side, but replacing the cable seems to have done the job for now fortunately.

Richard Hillman

Had a flat on my front wheel, changed the tube and but the tyre was tough to get back on (Continental). Now the tyre is wobbly. There is not an even line above the rim. I have taken it off and refitted a couple of times and it just won't set on the rim.

I have looked at a ton of YouTube videos. Soap & Water to lube it up, even used coconut oil. I half inflated to fix it and overinflated to fix it. Tried to cycle it out over a couple of Km whilst fully inflated. Even did a half inflate up and down the road to see if it sets. Nothing is working.

It's a relatively new bike, about a month old. Help......

magicbastarder

my routine is to pump to about 25psi and them manipulate the tyre into place - you can usually see where the bead of the tyre has not seated up into the rim, so you can push it inwards and there's usually enough pressure to push the tyre up into place. not sure if that's what you meant by half inflating it.

mosstin

https://www.boards.ie/discussion/comment/117779670#Comment_117779670

Nope, no evidence at all. Had Ultegra derailleurs for years and never seen anything like this.

https://www.boards.ie/discussion/comment/117790152#Comment_117790152

Where did it break? Did the cage plate come away or something further up like the pivots?

nicksnikita

https://www.boards.ie/discussion/comment/117788394#Comment_117788394

Tidy. If you’re comfortable doing it, remove the caliper, remove the pads so they don’t get contaminated, clean the caliper and spray the pivots with wd40 or equivalent. She’ll be right as rain

nicksnikita

he

https://www.boards.ie/discussion/comment/117788544#Comment_117788544

Here’s what I would try......remove tyre and warm it up. I’d leave mine in front of the fire for a bit but a hair drier might do the trick as well. Fit the tyre and inflate to approx.20psi. Roll the wheel around, pushing downwards on the tyre. Fully inflate. Never fails

mosstin

https://www.boards.ie/discussion/comment/117790229#Comment_117790229

It snapped where the cage plate is connected to the rest of the derailleur. Cage plate itself is intact.

Elvis Hammond

https://www.boards.ie/discussion/comment/117790850#Comment_117790850

RD is a pretty vulnerable component, so you'd have to be sure it hasn't been accidentally damaged.

Acquiescence

What are peoples opinions on replacing tyres individually?

I've GP5000s front and rear, the front looks to have a lot left on it. There are literal chunks missing out of the rear, I've been meaning to change it for about 1000km. I think it was a dud tyre (to be read as I'm the bones of 90kg and spend most of my time on backroads).

I have two new ones in front of me on the desk.

f1000

https://www.boards.ie/discussion/comment/117794188#Comment_117794188

this is my take - put the better tyre on the front. I do rotate tyres

cletus

Right folks, here's one for ye.

Out for a cycle the other day, and I noticed what seemed to be a clicking from the crank/bottom bracket area while coasting.

Had a look at it earlier on (I'm away from home, so no tools, stand etc). Watching the crank as the rear wheel is spinning, there is a slight bit of sway. I looked back at the cassette, and there is slight lateral movement while coasting (so the cassette isn't turning).

I honestly can't say whether or not I've seen that before, or if it's new.

Any suggestions?

hesker

Is it the wheel that is swaying?

And are you describing cassette wobble. That is normal enough if so

BTW all noises sound like they are coming from the BB regardless. I have a knocking problem in my own bike atm. Suspecting rough wheel bearings

cletus

Could be cassette wobble, it's moving in a slightly elliptical motion. Doesn't seem loose or anything.

Brian?

https://www.boards.ie/discussion/comment/117798228#Comment_117798228

Take the cassette off, make sure the 10mm bolt that holds the free hub on is tight. Put the cassette back on and see it it’s any better.

Richard Hillman

Just want to give an update on my issue in case it helps anyone else. Thanks for the help btw.

Essentially I wasn't overinflating the wheel. I was just using a hand pump and thinking I was pumping it up really hard but I wasn't really. I bought a foot pump with a pressure gauge, actually pumped it up as hard as it would go and the tyres popped into place. I lubed it up inside with some coconut oil before it. The noise of the pop was beautiful.

Don't know how I will deal with it if I am out in the middle of nowhere without the footpump but it's a start.

Cheers.

I'm trying to get a better bike fit and one of the most important steps is to measure the saddle height I know the suggested method is measure from the centre of the bottom bracket to the top of the saddle. My seatpost has a measurement scale on the back I presume the various numbers in centimetres and millimetres refers to the distance from the bottom bracket the seatpost is made by canyon.

Hope I explained that ok.