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Search: Posts Made By: grumpus
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
05-21-24, 08:52 PM
Replies: 18
Views: 342
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: 17
Views: 326
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: 15
Views: 334
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: 4
Views: 108
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: 163
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: 20
Views: 320
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: 311
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: 15
Views: 334
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: 329
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: 193
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: 181
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: 1,319
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: 1,137
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: 21
Views: 477
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: 163
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: 1,319
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: 792
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: 21
Views: 477
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: 14
Views: 325
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: 494
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: 1,137
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: 37
Views: 1,030
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: 37
Views: 1,030
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: 236
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: 1,137
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: 836
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: 503
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: 1,137
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: 104
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: 869
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: 869
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: 494
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: 521
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: 693
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: 302
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: 395
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: 896
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: 494
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: 400
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: 896
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: 395
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: 395
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: 494
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: 869
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: 273
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...
Forum: Bicycle Mechanics
05-13-24, 05:36 AM
Replies: 5
Views: 187
Posted By grumpus

Something is either too loose or dragging - go...

Something is either too loose or dragging - go from shifter all the way back to the chain, cleaning and lubricating each component and checking for wear. First bet would be cables, but shifters gum...
Forum: Bicycle Mechanics
05-13-24, 05:20 AM
Replies: 15
Views: 503
Posted By grumpus

Go to a fastener specialist, the common bike...

Go to a fastener specialist, the common bike fasteners are M5x0.8 and M6x1.0 which you will find in a variety of forms and finishes. I think button heads look the neatest, Torx is superior to Allen...
Forum: Bicycle Mechanics
05-13-24, 05:02 AM
Replies: 6
Views: 142
Posted By grumpus

Seems to me that pretty much is a gravel bike...

Seems to me that pretty much is a gravel bike already - I'd advise fitting the new tyres and seeing how it rides, if the worn out power train allows. If it's good then just replace those components...
Forum: Bicycle Mechanics
05-12-24, 07:56 PM
Replies: 22
Views: 494
Posted By grumpus

This manual...

This manual (https://si.shimano.com/en/pdfs/dm/CASG004/DM-CASG004-01-ENG.pdf) states:
//
In order to maintain proper performance, it is recommended that you contact the place of purchase or a...
Forum: Bicycle Mechanics
05-12-24, 07:14 PM
Replies: 9
Views: 273
Posted By grumpus

SG-C6061-8R appears to be a Di2 Nexus for roller...

SG-C6061-8R appears to be a Di2 Nexus for roller brake, exactly as the OP stated. He wrote "I can get" not "I have purchased". There's nothing about a Di2 hub that prevents you from making a...
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