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Search: Posts Made By: grumpus
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
05-09-24, 10:21 AM
Replies: 16
Views: 300
Posted By grumpus

It just needs a peg spanner with the right size...

It just needs a peg spanner with the right size pegs, I expect some circlip pliers would work too. It would be an easy tool to make ... If it's stuck then heat should help, or soak it in penetrating...
Forum: Bicycle Mechanics
05-09-24, 10:11 AM
Replies: 8
Views: 204
Posted By grumpus

Otherwise known as an Italian valve, not commonly...

Otherwise known as an Italian valve, not commonly seen beyond southern Europe.
Forum: Bicycle Mechanics
05-09-24, 10:09 AM
Replies: 17
Views: 301
Posted By grumpus

It might not have been supplied with your...

It might not have been supplied with your cassette but there is a Shimano lockring that is too large for 11t top sprockets. It's the same thread size and uses the same tool but has larger outside...
Forum: Bicycle Mechanics
05-09-24, 08:32 AM
Replies: 28
Views: 702
Posted By grumpus

Really? I expect play in cheap cartridge bearings...

Really? I expect play in cheap cartridge bearings after some use, as long as it's within acceptable limits and I can't feel it when riding I just don't worry about it. I carefully adjust the bearings...
Forum: Bicycle Mechanics
05-09-24, 08:16 AM
Replies: 51
Views: 33,158
Posted By grumpus

Ideally you would have cut the thread in a lathe...

Ideally you would have cut the thread in a lathe before assembling the fork, using the headset you intended to use as a guide to depth of cut for best fit. Then build the fork and put it back in the...
Forum: Bicycle Mechanics
05-09-24, 07:39 AM
Replies: 24
Views: 1,381
Posted By grumpus

I was going to suggest drilling/reaming, but I'd...

I was going to suggest drilling/reaming, but I'd add a milling cutter to the list.
Forum: Bicycle Mechanics
05-09-24, 07:08 AM
Replies: 87
Views: 2,459
Posted By grumpus

Presta locknuts are handy for spacing 5 mm...

Presta locknuts are handy for spacing 5 mm fasteners, they wouldn't be my first choice for 6 mm. But you did it, it works, no need for further discussion. 😄
FWIW I think the fork blades are sitting...
Forum: Bicycle Mechanics
05-09-24, 06:52 AM
Replies: 17
Views: 301
Posted By grumpus

Sounds like you're using the smaller lockring on...

Sounds like you're using the smaller lockring on both cassettes - that's fine, but the original larger 12t lockring will stop the chain fully engaging with the 11t sprocket.
Forum: Bicycle Mechanics
05-09-24, 06:40 AM
Replies: 31
Views: 590
Posted By grumpus

That's part of proper prep, you have to sand the...

That's part of proper prep, you have to sand the seam flat/smooth, which can be pretty tedious for a roadside repair - at home use a power tool.
Forum: Bicycle Mechanics
05-09-24, 05:20 AM
Replies: 57
Views: 1,278
Posted By grumpus

The easy solution to that is a VPN that lets you...

The easy solution to that is a VPN that lets you select endpoints in different countries.
Forum: Bicycle Mechanics
05-09-24, 04:55 AM
Replies: 59
Views: 1,030
Posted By grumpus

https://www.amazon.com/VAR-Nylon-Tire-Lever-System...

https://www.amazon.com/VAR-Nylon-Tire-Lever-System/dp/B004YJ30M8/
Forum: Bicycle Mechanics
05-07-24, 02:50 PM
Replies: 45
Views: 864
Posted By grumpus

OTOH they sell chains, but OTOH they sell user...

OTOH they sell chains, but OTOH they sell user experience ...
Forum: Bicycle Mechanics
05-07-24, 01:08 PM
Replies: 57
Views: 1,278
Posted By grumpus

Looks like a flat spot rather than a hop, I used...

Looks like a flat spot rather than a hop, I used to regularly fix these with a rubber hammer - just remove the surrounding spokes and beat it back into shape - but I've never tried it on a deep...
Forum: Bicycle Mechanics
05-07-24, 12:24 PM
Replies: 14
Views: 309
Posted By grumpus

I suspect this bike was also available with a...

I suspect this bike was also available with a rear hub motor. I recently worked on a rear hub motor that's spaced 142 mm with a regular threaded axle.
Forum: Bicycle Mechanics
05-07-24, 11:58 AM
Replies: 16
Views: 357
Posted By grumpus

I wouldn't ride those any further than I minded...

I wouldn't ride those any further than I minded walking home. These https://www.ebay.co.uk/itm/313181080692 are really good value if you're on 25-622.
Forum: Bicycle Mechanics
05-07-24, 10:28 AM
Replies: 31
Views: 590
Posted By grumpus

Not with those patches, just sand the area around...

Not with those patches, just sand the area around the hole, apply the patch and press firmly, with luck it will get you home (I've heard Slime patches are as mediocre as Slime sealant). For proper...
Forum: Bicycle Mechanics
05-07-24, 10:13 AM
Replies: 59
Views: 1,030
Posted By grumpus

I've never offered tube patching as a service...

I've never offered tube patching as a service when working in shops, only fitted a new tube. At the co-op where my time was free and new tubes were not I would occasionally patch a tube.
Forum: Bicycle Mechanics
05-07-24, 10:02 AM
Replies: 59
Views: 1,030
Posted By grumpus

QuikStik?

QuikStik?
Forum: Bicycle Mechanics
05-07-24, 09:53 AM
Replies: 59
Views: 1,030
Posted By grumpus

As I wrote, that's fine for most tyre/rim...

As I wrote, that's fine for most tyre/rim combinations ...
Forum: Bicycle Mechanics
05-07-24, 09:52 AM
Replies: 59
Views: 1,030
Posted By grumpus

You can fire 1/4" BBs at bike boxes really fast...

You can fire 1/4" BBs at bike boxes really fast with an air compressor ...
Forum: Bicycle Mechanics
05-07-24, 09:40 AM
Replies: 59
Views: 1,030
Posted By grumpus

It's often not so difficult once the tyre has had...

It's often not so difficult once the tyre has had some use, but I did have one set that I made sure to carry metal levers if I was going far from home.
Forum: Bicycle Mechanics
05-07-24, 09:37 AM
Replies: 59
Views: 1,030
Posted By grumpus

That's fine for most tyre/rim combinations but...

That's fine for most tyre/rim combinations but occasionally levers make a difficult job a lot easier; of course you have to be careful not to damage anything.
Forum: Bicycle Mechanics
05-07-24, 09:11 AM
Replies: 87
Views: 2,459
Posted By grumpus

Spooky.

Spooky.
Forum: Bicycle Mechanics
05-05-24, 04:35 PM
Replies: 8
Views: 183
Posted By grumpus

If ever you're not sure, remove the bolt and...

If ever you're not sure, remove the bolt and washer and look for the groove the cable should locate in. You'll not always be able to tell, particularly if the cable has been fitted in the wrong...
Forum: Bicycle Mechanics
05-05-24, 04:03 PM
Replies: 15
Views: 323
Posted By grumpus

I recently had to fit spacers to stop a...

I recently had to fit spacers to stop a derailleur mounting bolt from hitting the chain on the smallest sprocket - 10 x 16 x 1 mm stainless washers from Amazon made a neat job of it, and would also...
Forum: Bicycle Mechanics
05-05-24, 02:31 PM
Replies: 9
Views: 277
Posted By grumpus

I wouldn't use Velox on a tubeless ready rim, the...

I wouldn't use Velox on a tubeless ready rim, the bed is shaped and the tape wouldn't conform. Is there any reason not to use tubeless tape? Maybe a double layer if you're going to be running higher...
Forum: Bicycle Mechanics
05-05-24, 09:59 AM
Replies: 44
Views: 1,059
Posted By grumpus

Sounds like you're not cleaning the chain...

Sounds like you're not cleaning the chain internals, so as soon as you oil it and ride it some of the residue is floating out on the clean oil. My chain cleaning routine: remove, soak and shake in a...
Forum: Bicycle Mechanics
05-05-24, 09:33 AM
Replies: 87
Views: 2,459
Posted By grumpus

I did know someone whose front wheel locked up...

I did know someone whose front wheel locked up because a bit of tar-coated gravel jammed under his mudguard, they were those narrow flat aluminium close clearance guards that were popular in the late...
Forum: Bicycle Mechanics
05-05-24, 09:21 AM
Replies: 28
Views: 702
Posted By grumpus

So did you try actually using the pedals? Some...

So did you try actually using the pedals? Some that I use have only a small ball bearing at the outer end to locate the body on the spindle - the main load is taken by a plastic bushing and it feels...
Forum: Bicycle Mechanics
05-05-24, 07:46 AM
Replies: 39
Views: 707
Posted By grumpus

135 mm is MTB spacing - if it's now a road bike...

135 mm is MTB spacing - if it's now a road bike just bend it slightly so it's 130 mm wide, it's steel so it's fine to do that.
Forum: Bicycle Mechanics
05-05-24, 05:57 AM
Replies: 20
Views: 721
Posted By grumpus

I suspect under-inflation may be a significant...

I suspect under-inflation may be a significant factor when tube damage occurs.
Forum: Bicycle Mechanics
05-04-24, 04:53 PM
Replies: 20
Views: 721
Posted By grumpus

That doesn't look much better than the other one...

That doesn't look much better than the other one - tyres degrade with time, regardless of how worn the tread is, and this one appears to have some bead damage too.
Forum: Bicycle Mechanics
05-03-24, 11:03 AM
Replies: 45
Views: 1,170
Posted By grumpus

Some product may be out of tolerance due to...

Some product may be out of tolerance due to ineffective QC?
Forum: Bicycle Mechanics
05-03-24, 10:57 AM
Replies: 20
Views: 721
Posted By grumpus

I've sanded a taper in the overlapping parts and...

I've sanded a taper in the overlapping parts and rounded the corners, but if it's TPU you might be able to weld the ends together - making it endless would remove the problem (but make it harder to...
Forum: Bicycle Mechanics
05-03-24, 10:36 AM
Replies: 20
Views: 366
Posted By grumpus

There's history for steering stops on bikes, but...

There's history for steering stops on bikes, but this was usually just an attachment or protrusion on the fork crown that hit a stop on the frame. Newer utility bikes or cruisers often have a spring...
Forum: Bicycle Mechanics
05-02-24, 01:27 PM
Replies: 20
Views: 721
Posted By grumpus

No, it definitely was not still usable - if the...

No, it definitely was not still usable - if the carcass is distorted the tyre is garbage, the threads that hold it together are broken, and more will follow. The threads wrap around the steel bead to...
Forum: Bicycle Mechanics
05-02-24, 01:05 PM
Replies: 87
Views: 2,459
Posted By grumpus

I wonder what would happen if you could place a...

I wonder what would happen if you could place a sliver of shim under the front of the brake bolt, and another over the back of it, or even just wedge something under the brake as you tighten its...
Forum: Bicycle Mechanics
05-02-24, 12:27 PM
Replies: 11
Views: 1,156
Posted By grumpus

You're replying to someone who hasn't posted in...

You're replying to someone who hasn't posted in 22 years.
Forum: Bicycle Mechanics
05-02-24, 11:16 AM
Replies: 20
Views: 721
Posted By grumpus

It's a wide tube, it will patch just fine with a...

It's a wide tube, it will patch just fine with a large patch as long as it's properly prepared.
Forum: Bicycle Mechanics
05-02-24, 11:12 AM
Replies: 20
Views: 721
Posted By grumpus

Looks like a typical unseated bead blowout - the...

Looks like a typical unseated bead blowout - the tyre wasn't fitted straight, the bike was left under hot sun and pressure rose to the point the tube escaped. Tire liners can cause as many problems...
Forum: Bicycle Mechanics
05-02-24, 10:51 AM
Replies: 14
Views: 446
Posted By grumpus

Traditional road bars are 26.0 mm in the centre...

Traditional road bars are 26.0 mm in the centre (except older Cinelli 26.4, some 3TTT 26.2) and 15/16" (23.8 mm) on the grip area. Newer bars are 31.8 in the clamp area. Somewhere in between those...
Forum: Bicycle Mechanics
05-01-24, 02:21 PM
Replies: 38
Views: 1,000
Posted By grumpus

I think it might vary a lot depending on where...

I think it might vary a lot depending on where the mechanic worked - Germans use dynamo hubs (they have mandated effective lighting too - it's almost as if they think bicycles are proper road...
Forum: Bicycle Mechanics
05-01-24, 01:10 PM
Replies: 38
Views: 1,000
Posted By grumpus

Whether or not you were aware of rim wear...

Whether or not you were aware of rim wear happening or not in places that you worked, it definitely does happen to the extent that rims require replacement on a regular basis for some higher mileage...
Forum: Bicycle Mechanics
05-01-24, 05:58 AM
Replies: 10
Views: 208
Posted By grumpus

If it's nice quality and a bit different maybe...

If it's nice quality and a bit different maybe it's worth a little inconvenience - perhaps not something for your commuter, but a definite maybe for one of the Sunday bikes. Support and spares aren't...
Forum: Bicycle Mechanics
04-30-24, 01:09 PM
Replies: 8
Views: 243
Posted By grumpus

Did you tighten the chainring bolts?

Did you tighten the chainring bolts?
Forum: Bicycle Mechanics
04-30-24, 01:03 PM
Replies: 38
Views: 1,000
Posted By grumpus

Some rims are skimmed on the braking surface so...

Some rims are skimmed on the braking surface so the coating doesn't interfere with braking, and to make the rim surfaces more precisely parallel, some rims are lightly grooved which increases brake...
Forum: Bicycle Mechanics
04-29-24, 08:30 PM
Replies: 13
Views: 293
Posted By grumpus

Indeed, but to me it looks a bit close to the...

Indeed, but to me it looks a bit close to the bead to be brake block rub, and the OP stated the blocks aren't near the tyre. Of course the brake could be flexing enough that the block contacts the...
Forum: Bicycle Mechanics
04-29-24, 08:19 PM
Replies: 20
Views: 367
Posted By grumpus

Ammonia solution as used for domestic cleaning is...

Ammonia solution as used for domestic cleaning is supposed to be the magical elixir for this, I've never tried it myself.
Forum: Bicycle Mechanics
04-29-24, 08:03 PM
Replies: 13
Views: 293
Posted By grumpus

Rim brake? I'd suspect the rim is getting hot,...

Rim brake? I'd suspect the rim is getting hot, and the bit with best contact, the bead hook, is softening the rubber and digging into it. But rail trails shouldn't do that, even on a heavy tandem. If...
Forum: Bicycle Mechanics
04-29-24, 11:33 AM
Replies: 6
Views: 168
Posted By grumpus

I wouldn't worry about it as long the chain stays...

I wouldn't worry about it as long the chain stays on the ring, which it probably will (if there are bent or ragged bits you can straighten and smooth them, if the ring is actually warped you will...
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