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Search: Posts Made By: grumpus
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
05-26-24, 02:20 PM
Replies: 72
Views: 1,221
Posted By grumpus

A lot of those bikes are also pretty shoddy, and...

A lot of those bikes are also pretty shoddy, and a slowly sinking seatpost is not uncommon, adding a screw to stop this is not a new technique.
Forum: Bicycle Mechanics
05-26-24, 02:11 PM
Replies: 72
Views: 1,221
Posted By grumpus

Definitely to be avoided with aluminium...

Definitely to be avoided with aluminium seatposts, but an old steel seatpost won't crack in the same way, and it was the custom to have taller frames & shorter seatposts back then so a smaller moment...
Forum: Bicycle Mechanics
05-26-24, 01:52 PM
Replies: 72
Views: 1,221
Posted By grumpus

Do you have a steel seatpost in a 1960s bike?...

Do you have a steel seatpost in a 1960s bike? Because that's what I was discussing - maybe you missed the context.
Forum: Bicycle Mechanics
05-26-24, 11:55 AM
Replies: 19
Views: 12,736
Posted By grumpus

That's how I do it - jam a flat screwdriver...

That's how I do it - jam a flat screwdriver against the cone, tighten the lock nut. It can take a few attempts to get it adjusted just right, but you don't have to do this often unless you ride...
Forum: Bicycle Mechanics
05-26-24, 11:39 AM
Replies: 5
Views: 117
Posted By grumpus

The way you wave the camera around makes it hard...

The way you wave the camera around makes it hard to get an idea of what's actually happening.
Forum: Bicycle Mechanics
05-26-24, 10:53 AM
Replies: 72
Views: 1,221
Posted By grumpus

You can drill multiple holes in a helical pattern...

You can drill multiple holes in a helical pattern to allow fine adjustment, then transfer the height to a 'good" seatpost if you don't like the ventilated one.
Forum: Bicycle Mechanics
05-26-24, 09:00 AM
Replies: 72
Views: 1,221
Posted By grumpus

Back in the day when most bikes had chromed steel...

Back in the day when most bikes had chromed steel seatposts in steel frames we could have problems with them slipping, which was perhaps as much to do with manufacturing tolerances as material...
Forum: Bicycle Mechanics
05-26-24, 08:30 AM
Replies: 10
Views: 215
Posted By grumpus

I'd suggest a 35 - 40 mm tyre on that rim,...

I'd suggest a 35 - 40 mm tyre on that rim, something like a Kojak or Marathon Plus (not my favourite, but lots of people swear by them) both rated at 95 psi.
Forum: Bicycle Mechanics
05-25-24, 06:53 PM
Replies: 12
Views: 260
Posted By grumpus

Extra layers of rim tape?

Extra layers of rim tape?
Forum: Folding Bikes
05-25-24, 06:51 PM
Replies: 37
Views: 1,425
Posted By grumpus

The problem is not the height but the distance...

The problem is not the height but the distance from the steering axis. Better to attach it rigidly to the frame as is customary with cargo bikes. Otherwise fit half the basket either side of the...
Forum: Bicycle Mechanics
05-25-24, 06:07 PM
Replies: 9
Views: 211
Posted By grumpus

Set up the hub to work with the gears, when...

Set up the hub to work with the gears, when you're done with that dish the wheel to suit - setting the hub spacing to suit the wheel dish seems like the tail wagging the dog. What are you even trying...
Forum: Bicycle Mechanics
05-24-24, 03:04 PM
Replies: 9
Views: 211
Posted By grumpus

Moving the freehub effectively moves the dropout...

Moving the freehub effectively moves the dropout too, so you don't gain any clearance.
Forum: Bicycle Mechanics
05-24-24, 01:40 PM
Replies: 28
Views: 787
Posted By grumpus

The 8-9-10 mm Y wrench was one of my most used...

The 8-9-10 mm Y wrench was one of my most used tools, I don't recall who made it but it was just the right size, enough leverage and also fit in small spaces.
Forum: Bicycle Mechanics
05-24-24, 11:40 AM
Replies: 22
Views: 479
Posted By grumpus

You seem to have your highs and lows confused -...

You seem to have your highs and lows confused - high gear is fastest downhill, low gear is easiest uphill.
Forum: Bicycle Mechanics
05-24-24, 11:28 AM
Replies: 28
Views: 787
Posted By grumpus

They'd like you to think that, but they're really...

They'd like you to think that, but they're really just "pretty good" and convenient, often not "the best". VAR, Hozan, Knipex etc. make some great stuff, but they don't have the all-encompassing...
Forum: Bicycle Mechanics
05-24-24, 05:02 AM
Replies: 7
Views: 195
Posted By grumpus

Assuming you're using the outer two positions and...

Assuming you're using the outer two positions and clearance is not a problem, you want to move them inwards by half the small-to-middle distance to centre the chainline, and assuming axles are...
Forum: Bicycle Mechanics
05-21-24, 08:52 PM
Replies: 18
Views: 467
Posted By grumpus

Be aware that metric fasteners come in multiple...

Be aware that metric fasteners come in multiple pitches, sellers may not state which one - M5 could be M5x0.8 or M5x0.5, M6 could be M6x1.0 or M6x0.75 - the bicycle versions are the more common...
Forum: Bicycle Mechanics
05-21-24, 07:16 PM
Replies: 20
Views: 456
Posted By grumpus

Shimano says that FD should have 45 mm chainline,...

Shimano says that FD should have 45 mm chainline, so measure from the middle chainring to the middle of the seat tube - is it more than 45 mm?
Forum: Bicycle Mechanics
05-20-24, 02:12 PM
Replies: 18
Views: 510
Posted By grumpus

It's just as likely the bike uses a proprietary...

It's just as likely the bike uses a proprietary front hub and the replacement conforms to standard dimensions. I've had no problems with most of the weirdly named stuff I've bought from AliExpress.
Forum: Bicycle Mechanics
05-20-24, 01:54 PM
Replies: 5
Views: 166
Posted By grumpus

Two things to check: • Spherical washers are...

Two things to check:
• Spherical washers are assembled in the correct order and orientation so they can actually work as intended.
• Brake bosses are parallel as seen from above, to give the brake...
Forum: Bicycle Mechanics
05-20-24, 12:57 PM
Replies: 5
Views: 211
Posted By grumpus

3 speed Cartridge Coaster, a development of the...

3 speed Cartridge Coaster, a development of the original 333 hub according to Sheldon.
Forum: Bicycle Mechanics
05-20-24, 12:03 PM
Replies: 28
Views: 590
Posted By grumpus

Rewarding to check things off, depressing to see...

Rewarding to check things off, depressing to see them still there.
Forum: Bicycle Mechanics
05-20-24, 11:58 AM
Replies: 10
Views: 358
Posted By grumpus

Not even on the wall or ceiling above your bed?

Not even on the wall or ceiling above your bed?
Forum: Bicycle Mechanics
05-20-24, 10:24 AM
Replies: 18
Views: 510
Posted By grumpus

Remove a spacer from the other side of the axle...

Remove a spacer from the other side of the axle and add it to this side. Re-dish as required.
Or add a spacer to this side of the axle and spring the fork to make it fit. Re-dish as required.
Or...
Forum: Bicycle Mechanics
05-19-24, 11:50 AM
Replies: 12
Views: 392
Posted By grumpus

Many years ago I used a NR front mech with a...

Many years ago I used a NR front mech with a 32-52 double and it worked fine for more than ten years, I don't know if it would have enough throw to handle a triple, you might have to adjust your...
Forum: Bicycle Mechanics
05-19-24, 11:13 AM
Replies: 2
Views: 209
Posted By grumpus

Need more information about the tyres, there are...

Need more information about the tyres, there are various puncture-resistant and airless tyre technologies. Assume they actually meant puncture resistant, otherwise they would not tell you how to deal...
Forum: Bicycle Mechanics
05-18-24, 09:10 AM
Replies: 4
Views: 200
Posted By grumpus

You might be able to extend your current...

You might be able to extend your current derailleur with a hanger extender (search wolf-tooth road-link then find a cheap Chinese substitute if you prefer). Or you may need a longer derailleur for...
Forum: Bicycle Mechanics
05-18-24, 08:42 AM
Replies: 49
Views: 1,411
Posted By grumpus

I should perhaps have explained that distinction,...

I should perhaps have explained that distinction, although I don't think anyone was going to try rendering blubber for their bike anyway. Good to know we have an effective plant-sourced replacement.
Forum: Bicycle Mechanics
05-18-24, 08:02 AM
Replies: 43
Views: 1,219
Posted By grumpus

I agree that for the most part a tube is a tube,...

I agree that for the most part a tube is a tube, unless you're talking thick thorn-resistant, extra-light skinny 700C, latex or TPU. But it was the used tyres I was commenting on.
Forum: Bicycle Mechanics
05-18-24, 07:54 AM
Replies: 26
Views: 724
Posted By grumpus

Thread stripped or head rounded? They look like...

Thread stripped or head rounded? They look like regular M5x0.8 stainless screws as used for mudguards and bottle cages. You should loosen both sides and slide the wheel back while centring it between...
Forum: Bicycle Mechanics
05-17-24, 04:10 PM
Replies: 5
Views: 175
Posted By grumpus

When the washer crushes it spreads out, so the...

When the washer crushes it spreads out, so the hole that was 5.2 mm diameter is now 4.7 mm and that doesn't fit over the screw threads. Cut it with side cutters and twist it off with pliers.
Forum: Bicycle Mechanics
05-17-24, 01:58 PM
Replies: 49
Views: 1,411
Posted By grumpus

Yep, 19th century sewing machine manuals tell you...

Yep, 19th century sewing machine manuals tell you to use "sperm oil" for smooth running. 😮
Forum: Bicycle Mechanics
05-17-24, 01:39 PM
Replies: 43
Views: 937
Posted By grumpus

I wonder who remembers the ACS Z-Rim.

I wonder who remembers the ACS Z-Rim.
Forum: Bicycle Mechanics
05-17-24, 11:22 AM
Replies: 26
Views: 724
Posted By grumpus

Loose chain knocking against the plastic chain...

Loose chain knocking against the plastic chain guard, needs adjusting. The freewheel sound is normal, probably amplified by the chain guard. The slight freewheel drag will probably clear up with use.
Forum: Bicycle Mechanics
05-17-24, 10:42 AM
Replies: 16
Views: 421
Posted By grumpus

Sounds like something is upside down or installed...

Sounds like something is upside down or installed in the wrong order.
Forum: Bicycle Mechanics
05-17-24, 08:35 AM
Replies: 22
Views: 528
Posted By grumpus

I hope their hubs work better than their website.

I hope their hubs work better than their website.
Forum: Bicycle Mechanics
05-17-24, 08:20 AM
Replies: 43
Views: 1,219
Posted By grumpus

ISTR the old school tyre shops used a heated...

ISTR the old school tyre shops used a heated press to get a raw rubber repair patch to fuse with the tyre, not sure what else was involved.
I'm all for saving money, but tyres are one thing I'll...
Forum: Bicycle Mechanics
05-17-24, 07:55 AM
Replies: 35
Views: 1,102
Posted By grumpus

"should be a place you can get solid, factual...

"should be a place you can get solid, factual information" ... "talk about how things should be" ...
I'll see you there. 😁
Forum: Bicycle Mechanics
05-16-24, 07:11 PM
Replies: 35
Views: 1,102
Posted By grumpus

Isn't that just like life in general?

Isn't that just like life in general?
Forum: Bicycle Mechanics
05-16-24, 06:20 PM
Replies: 6
Views: 254
Posted By grumpus

That looks like loads of space to me. The fender...

That looks like loads of space to me. The fender doesn't need to be wider than the tyre, water flings off towards the centre of the tread, so that's where you need cover. As long as the tyre fits...
Forum: Bicycle Mechanics
05-15-24, 01:10 PM
Replies: 43
Views: 1,219
Posted By grumpus

I used cyanoacrylate and a bit of plastic bag...

I used cyanoacrylate and a bit of plastic bag once, it got me home. But a good Rema Tip Top repair lasts the life of the tube, and I enjoy mending things that other people would throw away.
Forum: Bicycle Mechanics
05-15-24, 12:51 PM
Replies: 34
Views: 889
Posted By grumpus

Enough has already been said about your question,...

Enough has already been said about your question, and more generally, but I feel I must add:
the types of caliper brake are - side pull, centre pull, hydraulic rim, and hydraulic disc. I expect when...
Forum: Bicycle Mechanics
05-15-24, 12:28 PM
Replies: 15
Views: 538
Posted By grumpus

Aluminium alloys can be as strong as steel and...

Aluminium alloys can be as strong as steel and significantly lighter, comparable to titanium, but titanium alloys tend to be significantly harder. Aluminium is much easier to machine than titanium,...
Forum: Bicycle Mechanics
05-15-24, 12:20 PM
Replies: 43
Views: 1,219
Posted By grumpus

I've always assumed it breaks sulphur bonds in...

I've always assumed it breaks sulphur bonds in the rubber molecules on the surface of the tube, and the surface of the patch also has unvulcanised rubber and sulphur in some form. Slap them together...
Forum: Bicycle Mechanics
05-15-24, 11:57 AM
Replies: 2
Views: 111
Posted By grumpus

I'd buy a new grip rubber, and while fitting it...

I'd buy a new grip rubber, and while fitting it I'd clean and lubricate the shifter.
Forum: Bicycle Mechanics
05-15-24, 11:28 AM
Replies: 28
Views: 929
Posted By grumpus

Weren't those the style that had the counterbored...

Weren't those the style that had the counterbored pinch bolt passing through the stem extension, or was there was some other failure I'm not aware of?
Forum: Bicycle Mechanics
05-14-24, 07:12 PM
Replies: 28
Views: 929
Posted By grumpus

It looks like a very normal single bolt quill...

It looks like a very normal single bolt quill stem to me.
Forum: Bicycle Mechanics
05-14-24, 05:26 AM
Replies: 22
Views: 528
Posted By grumpus

When the IGH is sold as a robust low-maintenance...

When the IGH is sold as a robust low-maintenance system Shimano's offerings seem surprisingly dependant on maintenance. Compared to Rohloff's 5000 km/annual service interval and 100,000 km life...
Forum: Bicycle Mechanics
05-14-24, 04:50 AM
Replies: 31
Views: 563
Posted By grumpus

Fluorescent stuff to trace aircon refrigerant...

Fluorescent stuff to trace aircon refrigerant leaks.
Forum: Bicycle Mechanics
05-13-24, 05:00 PM
Replies: 23
Views: 735
Posted By grumpus

Bits of extraneous metal jammed in the freewheel?...

Bits of extraneous metal jammed in the freewheel? Guessing, I've never had much to do with these, I used to be good with Sturmey Archer.
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