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Search: Posts Made By: grumpus
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
04-18-24, 05:51 PM
Replies: 33
Views: 753
Posted By grumpus

Je suis désolé, excusez moi s'il vous plâit Mlle....

Je suis désolé, excusez moi s'il vous plâit Mlle. (That's about as far as I can get on my own.)
Forum: Bicycle Mechanics
04-18-24, 04:57 PM
Replies: 33
Views: 753
Posted By grumpus

In the photos he posted the ferrules are clearly...

In the photos he posted the ferrules are clearly visible
Forum: Bicycle Mechanics
04-18-24, 10:20 AM
Replies: 35
Views: 940
Posted By grumpus

Position, push, feeble click, adjust. Position,...

Position, push, feeble click, adjust. Position, push, push harder, push really hard, adjust. GOTO 0.
I should probably take it apart and figure out what's wrong.
Forum: Recumbent
04-18-24, 07:59 AM
Replies: 2
Views: 294
Posted By grumpus

I'm not familiar with the Weber system but it...

I'm not familiar with the Weber system but it seems all you have to do is pick a trailer that attaches to the rear axle, then replace its coupling with the right size of Weber drawbar connector.
Forum: Bicycle Mechanics
04-18-24, 06:21 AM
Replies: 31
Views: 12,848
Posted By grumpus

Pliers. I don't think that would work if the...

Pliers. I don't think that would work if the skewer was properly tight. An angle grinder will work every time, just don't spoil the paint with a shower of sparks.
Forum: Bicycle Mechanics
04-18-24, 06:08 AM
Replies: 35
Views: 940
Posted By grumpus

Just like a tiny air hammer - an interesting idea.

Just like a tiny air hammer - an interesting idea.
Forum: Bicycle Mechanics
04-18-24, 05:59 AM
Replies: 12
Views: 315
Posted By grumpus

Properly adjusted and lubricated, with good...

Properly adjusted and lubricated, with good friction material and cables, shorter side-pulls like these are perfectly adequate. Some of us enjoy riding old bikes and prefer to leave them original,...
Forum: Bicycle Mechanics
04-17-24, 07:51 PM
Replies: 13
Views: 348
Posted By grumpus

To me it looks to have been milled into the top...

To me it looks to have been milled into the top face of the crown.
edit: On closer inspection I'm not so sure.
Forum: Bicycle Mechanics
04-17-24, 07:45 PM
Replies: 13
Views: 348
Posted By grumpus

That's a nice detail, I would have just filed it...

That's a nice detail, I would have just filed it flush.
That is an odd feature, indeed the whole fork is a bit odd - I'm wondering if the design is supposed to represent something, maybe the...
Forum: Bicycle Mechanics
04-17-24, 05:30 PM
Replies: 12
Views: 315
Posted By grumpus

The Weinmann button is a neat design - I imagine...

The Weinmann button is a neat design - I imagine you're not the only person who failed to notice its added function, in fact I have a vague recollection of someone complaining about its sloppy fit.
Forum: Bicycle Mechanics
04-17-24, 04:56 PM
Replies: 12
Views: 315
Posted By grumpus

1 & 2 never crossed my mind, I forget the varying...

1 & 2 never crossed my mind, I forget the varying experience levels here, and language differences.
And some have a release on the lever.
Forum: Bicycle Mechanics
04-17-24, 04:48 PM
Replies: 12
Views: 315
Posted By grumpus

Depends. Sometimes you can just grab the rubber...

Depends. Sometimes you can just grab the rubber block with pliers and twist it out, or stick a flat screwdriver in the end and pry it. Then you have to tweak the holder to fit the new friction...
Forum: Bicycle Mechanics
04-17-24, 04:18 PM
Replies: 13
Views: 348
Posted By grumpus

It appears to have been intended for a recessed...

It appears to have been intended for a recessed brake mount, something that only caught on in the 1980s.
Forum: Bicycle Mechanics
04-17-24, 04:10 PM
Replies: 7
Views: 156
Posted By grumpus

Have you been checked for B12 vitamin deficiency?

Have you been checked for B12 vitamin deficiency?
Forum: Bicycle Mechanics
04-17-24, 09:33 AM
Replies: 30
Views: 717
Posted By grumpus

An internal hub gear (IGH) would be ideal for...

An internal hub gear (IGH) would be ideal for this, you might get lucky and find a Sturmey Archer with a drum brake that will slot right in, and work even if the rim gets dented. All you need to true...
Forum: Bicycle Mechanics
04-17-24, 08:37 AM
Replies: 33
Views: 753
Posted By grumpus

I think Weinmann drillium levers look fine, as...

I think Weinmann drillium levers look fine, as well as being more comfortable than the Italian ones, but they're possibly a bit low-rent for serious classics.
Forum: Bicycle Mechanics
04-17-24, 05:28 AM
Replies: 15
Views: 577
Posted By grumpus

I thought that at first, but they appear to be...

I thought that at first, but they appear to be only approximately 180° apart and I don't think the crack on the right is straight.
Forum: Bicycle Mechanics
04-16-24, 01:48 PM
Replies: 8
Views: 356
Posted By grumpus

Switching from 2x to 1x? You should use a...

Switching from 2x to 1x? You should use a slightly shorter bbkt spindle for correct chainline, assuming it was correct to start with. Are there horror stories about aftermarket bbkts failing...
Forum: Bicycle Mechanics
04-16-24, 01:17 PM
Replies: 10
Views: 377
Posted By grumpus

If you take the chain off and spin the wheel does...

If you take the chain off and spin the wheel does it still slow down fast? That would indicate the hub bearings need attention. Otherwise it's likely just the freehub - if you take it off the hub you...
Forum: Bicycle Mechanics
04-16-24, 01:01 PM
Replies: 3
Views: 147
Posted By grumpus

The dropouts may be too thin for the QR to clamp...

The dropouts may be too thin for the QR to clamp securely, the axle should not extend past the dropout - you may need to file the ends of the axles. Dropout alignment is easiest done with the proper...
Forum: Bicycle Mechanics
04-16-24, 05:14 AM
Replies: 18
Views: 8,346
Posted By grumpus

That's incorrect - there were several different...

That's incorrect - there were several different length link wires, the correct one is determined by the spacing of the brake bosses and the rim width. The link wire arrangement was just a CYA from...
Forum: Bicycle Mechanics
04-16-24, 04:13 AM
Replies: 26
Views: 743
Posted By grumpus

You beat me to it. I wonder if that was done at...

You beat me to it. I wonder if that was done at the chain factory or by the bike builder.
Forum: Bicycle Mechanics
04-16-24, 04:04 AM
Replies: 15
Views: 444
Posted By grumpus

I'm pretty sure a conventional welder can't do...

I'm pretty sure a conventional welder can't do explosion cladding. Or are you suggesting we should use a bimetal layer to "fix" the freehub? 😁
Forum: Bicycle Mechanics
04-15-24, 01:25 PM
Replies: 15
Views: 444
Posted By grumpus

Does it weld steel to aluminium?

Does it weld steel to aluminium?
Forum: Bicycle Mechanics
04-15-24, 01:08 PM
Replies: 15
Views: 403
Posted By grumpus

The cable is probably repairable, I'd try if it...

The cable is probably repairable, I'd try if it was mine but I wouldn't offer to do it for a customer because it would be time consuming and not guaranteed, and isn't the lever broken anyway?
Forum: Bicycle Mechanics
04-15-24, 12:57 PM
Replies: 10
Views: 372
Posted By grumpus

Steel fastener in aluminium frame will likely...

Steel fastener in aluminium frame will likely cause galvanic corrosion over time, particularly if it gets salty from road salt or sweat or spilled electrolyte replacement beverage, so it's a good...
Forum: Bicycle Mechanics
04-15-24, 12:24 PM
Replies: 35
Views: 940
Posted By grumpus

They can be great in blind holes, not sure why...

They can be great in blind holes, not sure why you'd prefer one over a right handed drill when there's access from the back.
Forum: Bicycle Mechanics
04-15-24, 12:21 PM
Replies: 35
Views: 940
Posted By grumpus

First reply, before he'd posted the photo. ...

First reply, before he'd posted the photo.

I'd assumed we were talking about bosses on the dropout - seat stays puts a different complexion on it, and the ultimate solution is to unbraze the...
Forum: Bicycle Mechanics
04-15-24, 11:07 AM
Replies: 28
Views: 749
Posted By grumpus

No; adjust the cable at the clamp only to take up...

No; adjust the cable at the clamp only to take up slack in the cable, without moving the actuating arm, then wind the barrel adjuster out until the actuating arm just starts to rotate from its...
Forum: Bicycle Mechanics
04-14-24, 12:48 PM
Replies: 33
Views: 753
Posted By grumpus

Clean the rims with acetone and wire wool. Check...

Clean the rims with acetone and wire wool. Check the cable is moving freely, the pivots are not slack and not binding, the arms aren't rubbing, the spring legs are sliding on the arms, the blocks are...
Forum: Classic & Vintage
04-14-24, 03:38 AM
Replies: 69
Views: 1,826
Posted By grumpus

I'm with you on the sensibly low gears, although...

I'm with you on the sensibly low gears, although maybe not that low, my Stronglights go down to 28t with a 28 or 32t on the back. It might be possible to graft a granny sprocket inside a double*, the...
Forum: Bicycle Mechanics
04-14-24, 02:06 AM
Replies: 35
Views: 940
Posted By grumpus

In that case it's probably fairly easy to weld up...

In that case it's probably fairly easy to weld up a ragged hole and drill and tap a new one. Worst case scenario, if surgical removal fails and oversizing to 6 mm is not appropriate.
Forum: General Cycling Discussion
04-14-24, 02:01 AM
Replies: 21
Views: 614
Posted By grumpus

That's a similar sort of bike to the first one I...

That's a similar sort of bike to the first one I had as a teen, except mine was three speed. At weekends I would do a 18 mile round trip to go shopping in a neighbouring town (there was a very good...
Forum: Bicycle Mechanics
04-14-24, 01:05 AM
Replies: 28
Views: 982
Posted By grumpus

I'd have thought you'd let the inside wheel lift...

I'd have thought you'd let the inside wheel lift slightly - your centre of mass would then be inside a line between the remaining contact patches, effectively leaning into the corner more. I know...
Forum: Bicycle Mechanics
04-13-24, 08:08 PM
Replies: 17
Views: 477
Posted By grumpus

You can't tell them, they have to learn for...

You can't tell them, they have to learn for themselves. Could you resist a "told you so"?
Forum: Classic & Vintage
04-13-24, 07:59 PM
Replies: 69
Views: 1,826
Posted By grumpus

I had some 152 mm, 4 x 110 bcd from Amazon a...

I had some 152 mm, 4 x 110 bcd from Amazon a couple of weeks ago, seem reasonable quality if not the lightest. Stronglight Impact single or double, 5 x 110 bcd comes in 130, 145, 150, 155, 160, 165,...
Forum: Bicycle Mechanics
04-13-24, 06:35 PM
Replies: 10
Views: 276
Posted By grumpus

No, because the chain only wraps around about...

No, because the chain only wraps around about half of the chainring, so one more tooth, and the points where the chain engages with the chainring move apart only slightly. So more than a half link,...
Forum: Bicycle Mechanics
04-13-24, 06:21 PM
Replies: 17
Views: 477
Posted By grumpus

Illegally high-powered e-bikes annoy me, but for...

Illegally high-powered e-bikes annoy me, but for some reason a bolt-on ICE doesn't - go figure. I wonder how many of these projects are used for more than three weeks - I note that warranty seems to...
Forum: Classic & Vintage
04-13-24, 05:49 PM
Replies: 34
Views: 3,837
Posted By grumpus

I thought maybe a clamp-on cable stop had been...

I thought maybe a clamp-on cable stop had been over-tightened in a previous build. Or it could be just a trick of the light.
Forum: Bicycle Mechanics
04-13-24, 05:11 PM
Replies: 8
Views: 337
Posted By grumpus

Ah yes, modern stuff - I shouldn't assume that...

Ah yes, modern stuff - I shouldn't assume that everyone is using obsolete junk classic & vintage cycles.
Forum: Bicycle Mechanics
04-13-24, 05:00 PM
Replies: 17
Views: 477
Posted By grumpus

Whatever fork you get, choose one that will be...

Whatever fork you get, choose one that will be easy to fit a good brake on, because I don't think just a coaster will be very safe at motorised speeds.
Forum: Bicycle Mechanics
04-13-24, 04:53 PM
Replies: 35
Views: 940
Posted By grumpus

It's a standard auto mechanic technique, possibly...

It's a standard auto mechanic technique, possibly less effective on the 5 mm threads a bike mechanic has to remove. If you don't get good fusion pretty much as soon as you strike an arc you're just...
Forum: Bicycle Mechanics
04-12-24, 07:43 PM
Replies: 35
Views: 940
Posted By grumpus

You could try welding a washer to the screw, then...

You could try welding a washer to the screw, then a nut to the washer. This applies heat to the threads to loosen the rust scale, and gives you something to grab and turn; the weld won't stick to the...
Forum: Bicycle Mechanics
04-11-24, 09:18 PM
Replies: 18
Views: 8,346
Posted By grumpus

They have different internals for front and rear,...

They have different internals for front and rear, because the helical actuators need to turn in opposite directions. The front type was withdrawn because it was too easy for unwary riders to launch...
Forum: Bicycle Mechanics
04-11-24, 09:06 PM
Replies: 31
Views: 588
Posted By grumpus

You need to stay near current spacing or the...

You need to stay near current spacing or the chain will fall in the gap, but you could add extra rings and quadruple chainsets are not unknown. Adding more than one extra ring will likely exceed the...
Forum: Bicycle Mechanics
04-11-24, 08:17 PM
Replies: 8
Views: 349
Posted By grumpus

It's a freewheel, the extractor splines are...

It's a freewheel, the extractor splines are clearly visible, just a bit further back than on a 6 or 7 speed
Forum: Bicycle Mechanics
04-10-24, 06:23 PM
Replies: 33
Views: 1,234
Posted By grumpus

What you need there is a can of high build...

What you need there is a can of high build primer. I'd be interested to see what it looks like inside the head tube.
Forum: Bicycle Mechanics
04-10-24, 06:12 PM
Replies: 34
Views: 850
Posted By grumpus

Can't see any detail in those pictures, can...

Can't see any detail in those pictures, can barely see that it's a bike. Try putting the bike against a plain wall, with sunlight shining on it from behind you, close enough that it just fits in the...
Forum: Bicycle Mechanics
04-10-24, 05:47 PM
Replies: 16
Views: 408
Posted By grumpus

​​​​​​Mostly it's accumulated dirt or hardened...

​​​​​​Mostly it's accumulated dirt or hardened grease that causes this. While you're riding: several times push the lever forward and then release it so it returns rapidly by it's own spring tension...
Forum: Bicycle Mechanics
04-10-24, 05:25 PM
Replies: 13
Views: 344
Posted By grumpus

Use a torque wrench to avoid dangerous or costly...

Use a torque wrench to avoid dangerous or costly mistakes - Shimano states 4-6 Nm for that bolt.
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