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Search: Posts Made By: grumpus
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
05-05-24, 09:33 AM
Replies: 75
Views: 1,491
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: 18
Views: 383
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: 528
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: 603
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: 603
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: 17
Views: 359
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: 603
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: 320
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: 603
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: 75
Views: 1,491
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: 9
Views: 1,042
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: 603
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: 603
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: 407
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: 908
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: 908
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: 183
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: 214
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: 908
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: 267
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: 333
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: 267
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: 156
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...
Forum: Bicycle Mechanics
04-29-24, 11:18 AM
Replies: 8
Views: 221
Posted By grumpus

What a bodge to circumvent something that is...

What a bodge to circumvent something that is intended to make fender mounting neater. A little hole isn't going to make a fender useless on other bikes.
Forum: Bicycle Mechanics
04-29-24, 11:02 AM
Replies: 38
Views: 908
Posted By grumpus

Really? You can pretty much do that by sticking...

Really? You can pretty much do that by sticking abrasive paper to your brake blocks and coasting down a hill. Then clean the rim with IPA. Or just the IPA will probably work fine. Truing doesn't...
Forum: Bicycle Mechanics
04-29-24, 10:36 AM
Replies: 10
Views: 183
Posted By grumpus

This...

This (https://www.sicklines.com/tech/howto/hadleyoverhaul/) no good?
Forum: Bicycle Mechanics
04-28-24, 09:27 PM
Replies: 8
Views: 221
Posted By grumpus

I have a bike like that - the fender is fixed by...

I have a bike like that - the fender is fixed by drilling a 5 mm hole and screwing it directly to the threaded hole in the frame, you don't use the adjustable bridge that comes with the fender.
Forum: Bicycle Mechanics
04-28-24, 08:14 PM
Replies: 59
Views: 8,101
Posted By grumpus

It's not hard to re-space old steel frames, the...

It's not hard to re-space old steel frames, the rack wouldn't make it difficult, you just have to take care that you bend both sides equally, and check/adjust dropout alignment when you're done.
Forum: Bicycle Mechanics
04-28-24, 02:10 PM
Replies: 8
Views: 198
Posted By grumpus

They were wrong - V-brakes are more idiot-proof...

They were wrong - V-brakes are more idiot-proof than cantilever brakes, but they're not inherently superior.
Yes, you need direct-pull levers to match the brake arms, they pull more cable than...
Forum: Bicycle Mechanics
04-28-24, 01:57 PM
Replies: 18
Views: 463
Posted By grumpus

I recently binned a couple of Marathons that...

I recently binned a couple of Marathons that looked like they were ready to fail at the bead, very few signs of wear otherwise but I know they were a few years old.
Forum: Bicycle Mechanics
04-28-24, 01:32 PM
Replies: 59
Views: 8,101
Posted By grumpus

That's a nice build, but I would have just spread...

That's a nice build, but I would have just spread the frame to 130 or 135 mm and used a regular hub.
Forum: Bicycle Mechanics
04-28-24, 12:30 PM
Replies: 16
Views: 382
Posted By grumpus

Ashtabula crank, the grooved part is the...

Ashtabula crank, the grooved part is the adjusting cone and has a left handed thread, the normal way to turn it is with a flat blade screwdriver, it's only hand tight until you tighten the lock nut...
Forum: Bicycle Mechanics
04-28-24, 12:05 PM
Replies: 16
Views: 382
Posted By grumpus

You don't need to hit it hard, just a tap with a...

You don't need to hit it hard, just a tap with a screwdriver will do.
You don't have to hold the cone, there's a tab washer to stop it turning. Ashtabula cranks are only used on old or cheap bikes,...
Forum: Bicycle Mechanics
04-28-24, 09:23 AM
Replies: 18
Views: 463
Posted By grumpus

Last year I bought a cheap bike and immediately...

Last year I bought a cheap bike and immediately spent more than I'd paid on tyres, brake blocks and cables etc. to make it ridable. Did I think "That's more than the bike cost" or did I think "That's...
Forum: Bicycle Mechanics
04-27-24, 04:44 AM
Replies: 23
Views: 623
Posted By grumpus

I assumed he'd read the OP's profile.

I assumed he'd read the OP's profile.
Forum: Bicycle Mechanics
04-26-24, 01:37 PM
Replies: 4
Views: 176
Posted By grumpus

Surprising, my assumption would have been that...

Surprising, my assumption would have been that the timing chain is the least demanding place to put a ghost ring. It will remain a fun useful thing that I might try one day.
Forum: Bicycle Mechanics
04-26-24, 01:24 PM
Replies: 11
Views: 249
Posted By grumpus

Some of those results are the rear axle assembly...

Some of those results are the rear axle assembly from the cheapo Chinese trikes. Of the better looking kits, they're mostly for derailleur gears or coaster brakes, neither of which is suitable for...
Forum: Bicycle Mechanics
04-26-24, 12:52 PM
Replies: 4
Views: 176
Posted By grumpus

You only need a little over 1/4" axle movement if...

You only need a little over 1/4" axle movement if you don't mind using a half link in the chain. I wonder how much tension a ghost ring supports, without the hub it would normally be mounted on - I...
Forum: Bicycle Mechanics
04-26-24, 11:24 AM
Replies: 38
Views: 1,026
Posted By grumpus

Has it ever been left near cars? Just a tiny...

Has it ever been left near cars? Just a tiny accidental nudge with a bumper can do that, in your garage or locked up in the street.
Forum: Bicycle Mechanics
04-26-24, 11:14 AM
Replies: 19
Views: 11,893
Posted By grumpus

He's probably fixed it or given up in the ensuing...

He's probably fixed it or given up in the ensuing five years. The real easy fix is to use a threadless cartridge bottom bracket.
It doesn't have to be expensive, I recently bought one on eBay for...
Forum: Bicycle Mechanics
04-26-24, 11:05 AM
Replies: 11
Views: 249
Posted By grumpus

There are some really cheap Chinese trikes on the...

There are some really cheap Chinese trikes on the market now, selling new for the price of old used trikes but they are predictably heavy and low quality. I think if you could source just the axle...
Forum: Bicycle Mechanics
04-26-24, 10:40 AM
Replies: 11
Views: 249
Posted By grumpus

Agreed that most "training wheels" are junk -...

Agreed that most "training wheels" are junk - they don't teach kids how to ride a two wheeler, and don't provide improved stability at any speed (there have been sprung pivoting versions that are...
Forum: Bicycle Mechanics
04-26-24, 09:10 AM
Replies: 6
Views: 260
Posted By grumpus

Agree that looks like scuffs in the clear coat,...

Agree that looks like scuffs in the clear coat, or in some of the other photos into the colour coat too. First I'd try a squirt of WD40 or your preferred spray lube, and rub hard; after that some...
Forum: Bicycle Mechanics
04-25-24, 02:24 PM
Replies: 38
Views: 1,026
Posted By grumpus

We're not bending anything yet, just assessing.

We're not bending anything yet, just assessing.
Forum: Bicycle Mechanics
04-25-24, 01:59 PM
Replies: 38
Views: 1,026
Posted By grumpus

Yes I'm making assumptions, I'm trying to not get...

Yes I'm making assumptions, I'm trying to not get bogged down, to just get an overview of the situation. The unposted version did babble a bit about dropout alignment, it also jumped ahead and...
Forum: Bicycle Mechanics
04-25-24, 01:23 PM
Replies: 19
Views: 503
Posted By grumpus

It is, and it's not more effective for cleaning...

It is, and it's not more effective for cleaning bike parts than kerosene or diesel, which will not turn you into the human torch or destroy your house.
Forum: Bicycle Mechanics
04-25-24, 01:16 PM
Replies: 38
Views: 1,026
Posted By grumpus

OK, now we know the wheel is correctly dished,...

OK, now we know the wheel is correctly dished, and the dropouts need to move approximately 3.5 mm to the drive side, or at least they need to move so the rim moves 3.5 mm. That's not a lot, but it's...
Forum: Bicycle Mechanics
04-25-24, 12:09 PM
Replies: 65
Views: 2,237
Posted By grumpus

Stronglight 49D with 32-52 and 14-28 5s on the...

Stronglight 49D with 32-52 and 14-28 5s on the back. The rings were completely flat and with full profile teeth, as befits a crankset introduced in 1949 (the steel 49A was ten years older but...
Forum: Bicycle Mechanics
04-25-24, 10:56 AM
Replies: 13
Views: 311
Posted By grumpus

This was going to be my suggestion before I...

This was going to be my suggestion before I thought of noodles, but I'd use a grinder rather than a file - you can use a lighter touch so less risk of de-chucking. Having thought of noodles (again) I...
Forum: Bicycle Mechanics
04-25-24, 10:36 AM
Replies: 29
Views: 615
Posted By grumpus

I was going to amend my earlier post re: cut-down...

I was going to amend my earlier post re: cut-down old stem - I've an assortment of ally tubing that I use for sleeves and shims to make stuff fit where it doesn't, I probably have what the OP needed,...
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