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Search: Posts Made By: grumpus
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
05-24-24, 03:04 PM
Replies: 8
Views: 159
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: 732
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: 451
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: 732
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: 190
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: 459
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: 434
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: 486
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: 153
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: 203
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: 27
Views: 548
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: 350
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: 486
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: 386
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: 205
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: 195
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: 1,402
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: 1,205
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: 691
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: 173
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: 1,402
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: 892
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: 691
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: 404
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: 517
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: 1,205
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: 1,090
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: 1,090
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: 251
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: 1,205
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: 872
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: 530
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: 1,205
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: 110
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: 919
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: 919
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: 517
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: 544
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: 727
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.
Forum: Bicycle Mechanics
05-13-24, 02:07 PM
Replies: 6
Views: 321
Posted By grumpus

If they're not marked you can suit yourself,...

If they're not marked you can suit yourself, different people have different ideas, for example:
a) the chevron-like element of the tread should point forwards as seen from above (for quieter...
Forum: Bicycle Mechanics
05-13-24, 10:22 AM
Replies: 13
Views: 414
Posted By grumpus

Most steel bikes have a bit of rust somewhere,...

Most steel bikes have a bit of rust somewhere, most don't suffer catastrophic failure. Steel handlebar, was that cheap junk or exotic lightweight? A possibly damaged or defective handlebar would ring...
Forum: Bicycle Mechanics
05-13-24, 10:12 AM
Replies: 29
Views: 947
Posted By grumpus

Wheel building and bike fit aren't basics,...

Wheel building and bike fit aren't basics, they're extra credit like IGH and e-bikes. Frame prep i.e. facing/reaming/tapping where necessary is a mechanic's job, but you'd hope the builder had done...
Forum: Bicycle Mechanics
05-13-24, 09:01 AM
Replies: 22
Views: 517
Posted By grumpus

Not the same manual, different names, different...

Not the same manual, different names, different dates (mine is newer, maybe they revised the service advice?)
Forum: Bicycle Mechanics
05-13-24, 08:37 AM
Replies: 15
Views: 426
Posted By grumpus

I'd use one of these...

I'd use one of these https://www.amazon.com/Zona-SA35-35-050-52tpi-Razor/dp/B0006N736A/ and just cut it as square as I could. Truthfully I wouldn't bother with 2 mm, but I do find those saws useful...
Forum: Bicycle Mechanics
05-13-24, 08:14 AM
Replies: 29
Views: 947
Posted By grumpus

That requires a basic understanding of physical...

That requires a basic understanding of physical principles that many people seem to lack - bits of geometry and Newtonian physics that make things "obvious" to some, and totally obscure to others.
Forum: Bicycle Mechanics
05-13-24, 08:01 AM
Replies: 13
Views: 414
Posted By grumpus

Wire brush and phosphoric acid is good, the...

Wire brush and phosphoric acid is good, the little Dremel wire brushes reach into dents well. But clear coat it - IMHO a touchup job often looks worse than the original damage. A dent like this...
Forum: Bicycle Mechanics
05-13-24, 07:00 AM
Replies: 13
Views: 414
Posted By grumpus

MTB sizing is really based on top tube length and...

MTB sizing is really based on top tube length and stack height, seat tube length is just about crotch clearance. I have a roadified cross country 26" MTB with six inches more seatpost than my larger...
Forum: Bicycle Mechanics
05-13-24, 06:19 AM
Replies: 22
Views: 517
Posted By grumpus

The text that I quoted says "oil replacement or...

The text that I quoted says "oil replacement or lubrication after riding 1,000 km from the start of use" and the link I posted was this:...
Forum: Bicycle Mechanics
05-13-24, 06:11 AM
Replies: 28
Views: 919
Posted By grumpus

I was getting close to 50 mph when the wobble...

I was getting close to 50 mph when the wobble started, so I decided that was fast enough. I would probably have been okay on my other touring bike, with a heavier frame.
Forum: Bicycle Mechanics
05-13-24, 05:50 AM
Replies: 9
Views: 306
Posted By grumpus

I was thinking you could do it with a 3D printer;...

I was thinking you could do it with a 3D printer; all you need is a helical ramp with detents, mounted concentric with the axle, a sprung follower and two cables pulling in opposite directions going...
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