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Search: Posts Made By: grumpus
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
04-16-24, 01:17 PM
Replies: 9
Views: 260
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: 26
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: 8,274
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: 16
Views: 296
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: 14
Views: 306
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: 14
Views: 306
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: 348
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: 9
Views: 253
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: 25
Views: 562
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: 25
Views: 562
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: 665
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: 23
Views: 338
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: 1,767
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: 25
Views: 562
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: 12
Views: 391
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: 930
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: 417
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: 1,767
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: 241
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: 417
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: 3,770
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: 288
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: 417
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: 25
Views: 562
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: 25
Views: 562
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: 8,274
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: 541
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: 317
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: 1,137
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: 769
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: 373
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: 304
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.
Forum: Bicycle Mechanics
04-10-24, 05:11 PM
Replies: 4
Views: 201
Posted By grumpus

Check derailleur hanger alignment.

Check derailleur hanger alignment.
Forum: Bicycle Mechanics
04-10-24, 04:53 PM
Replies: 6
Views: 217
Posted By grumpus

The bbkt spindle needs to be the right length to...

The bbkt spindle needs to be the right length to align the chainset with the rear sprockets. You should be able to check by sighting along the middle chainring to the middle sprocket that alignment...
Forum: Bicycle Mechanics
04-09-24, 08:48 AM
Replies: 5
Views: 177
Posted By grumpus

Is that just where it squashed over the end of...

Is that just where it squashed over the end of the threaded part, when you tightened it down trying to make it work?
Forum: Bicycle Mechanics
04-09-24, 08:16 AM
Replies: 13
Views: 284
Posted By grumpus

The way I set it is so it's normal to a line from...

The way I set it is so it's normal to a line from the pivot to the straddle anchor points when the blocks hit the rim. With low profile cantilevers you often have to extend the blocks a fair way for...
Forum: Bicycle Mechanics
04-09-24, 07:35 AM
Replies: 26
Views: 1,053
Posted By grumpus

True. Sometimes I see a solid block of text like...

True. Sometimes I see a solid block of text like that and my brain just says "nope".
Forum: Classic & Vintage
04-08-24, 03:32 PM
Replies: 57
Views: 1,985
Posted By grumpus

That was probably their attempt to reduce toe...

That was probably their attempt to reduce toe strike. But stand over is low, so we'll call it a good fit. 😁
Forum: Bicycle Mechanics
04-08-24, 02:49 PM
Replies: 33
Views: 1,137
Posted By grumpus

If the butting is that close to the end then...

If the butting is that close to the end then someone used the wrong tube, or trimmed it in the wrong place.
Forum: Bicycle Mechanics
04-08-24, 12:51 PM
Replies: 33
Views: 1,137
Posted By grumpus

Probably started as a weld defect, I wonder if...

Probably started as a weld defect, I wonder if there was a previous repair or crash damage.
Forum: Bicycle Mechanics
04-08-24, 09:09 AM
Replies: 26
Views: 1,053
Posted By grumpus

Is it not more effective to partially disassemble...

Is it not more effective to partially disassemble them and attack the goo with brushes, solvent and compressed air?
Forum: Bicycle Mechanics
04-07-24, 10:17 AM
Replies: 24
Views: 634
Posted By grumpus

Sounds like they failed to check voltage drop on...

Sounds like they failed to check voltage drop on the connectors before condemning the parts, I wonder if simply removing/replacing the "bad" parts would have had the same effect as fitting new. It...
Forum: Bicycle Mechanics
04-06-24, 07:29 PM
Replies: 24
Views: 634
Posted By grumpus

Sticky cable?

Sticky cable?
Forum: Bicycle Mechanics
04-06-24, 07:19 PM
Replies: 30
Views: 985
Posted By grumpus

If you want to buy junk bike parts you can get...

If you want to buy junk bike parts you can get them cheap online without having to buy a Huffy. Don't your kids deserve something a bit better, like maybe stuff that works reasonably well and lasts a...
Forum: Bicycle Mechanics
04-05-24, 02:06 PM
Replies: 28
Views: 930
Posted By grumpus

I'm not sure that zero dish is the way to go:...

I'm not sure that zero dish is the way to go: most cornering force is going to be on the outside wheel, so doesn't it make sense to have a greater bracing angle on the outside of the wheel?
The...
Forum: Bicycle Mechanics
04-05-24, 01:04 PM
Replies: 15
Views: 381
Posted By grumpus

Well it depends - if it's microspline it's not...

Well it depends - if it's microspline it's not compatible with HyperGlide and the bodies can't be swapped.
Forum: Bicycle Mechanics
04-04-24, 01:14 PM
Replies: 28
Views: 930
Posted By grumpus

Commonly used on wheelchairs. They come with 12...

Commonly used on wheelchairs. They come with 12 mm or 1/2" axles, and various lengths.
Forum: Clydesdales/Athenas (200+ lb / 91+ kg)
04-04-24, 12:38 PM
Replies: 8
Views: 450
Posted By grumpus

Rebuild those damaged bikes with different...

Rebuild those damaged bikes with different frames. You could buy locally built steel frames, that suit your height and can be repaired easily should the need arise. (Always be sure you have plenty of...
Forum: Electric Bikes
04-04-24, 11:11 AM
Replies: 52
Views: 2,973
Posted By grumpus

​​​​​​ITYF that gyroscopic effect has been shown...

​​​​​​ITYF that gyroscopic effect has been shown to have minimal influence on the stability of a bike, such that you might notice it when riding no-hands, but not otherwise, certainly not when...
Forum: Electric Bikes
04-04-24, 08:08 AM
Replies: 4
Views: 229
Posted By grumpus

Carry a spare? They're cheap enough and easy to...

Carry a spare? They're cheap enough and easy to fit. I had one from Amazon yesterday, 42t branded "Snail", but that's for a RWD trike. I have one on my mid-drive bike too, I think that's 38t - the...
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