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Search: Posts Made By: grumpus
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
09-19-24, 09:23 AM
Replies: 19
Views: 334
Posted By grumpus

If it ran OK then it was tight and even-tensioned...

If it ran OK then it was tight and even-tensioned enough. Decades ago a spoke tension gauge was a rarity, manufacturers probably didn't publish maximum tension figures, yet many wheels were built...
Forum: Bicycle Mechanics
09-19-24, 08:24 AM
Replies: 61
Views: 1,718
Posted By grumpus

I only see one person getting inflamed here. Take...

I only see one person getting inflamed here. Take the post at face value or ignore it. If it's trolls playing "my thread is longer than yours" does it really matter? After all, someone could come...
Forum: Bicycle Mechanics
09-19-24, 08:02 AM
Replies: 27
Views: 520
Posted By grumpus

You can get domed Nyloc nuts which look quite...

You can get domed Nyloc nuts which look quite vintage.
Forum: Bicycle Mechanics
09-18-24, 10:57 AM
Replies: 4
Views: 157
Posted By grumpus

Figure out what's bent, bend it back or replace...

Figure out what's bent, bend it back or replace it. You really need to use a gear hanger alignment tool as the first step.
Forum: Bicycle Mechanics
09-18-24, 10:45 AM
Replies: 11
Views: 210
Posted By grumpus

Plenty good enough; it's assumed you'll only...

Plenty good enough; it's assumed you'll only accidentally use big/big anyway, and clearly it's possible to do it without breaking anything.
Forum: Bicycle Mechanics
09-18-24, 10:39 AM
Replies: 7
Views: 218
Posted By grumpus

I find the best way to approach this very...

I find the best way to approach this very specific problem is to replace the parts that need replacing and adjust the adjusters so they're properly adjusted. If you need to bleed cable brakes I...
Forum: Bicycle Mechanics
09-16-24, 06:16 PM
Replies: 61
Views: 1,718
Posted By grumpus

It's still cross chaining, but you have no choice...

It's still cross chaining, but you have no choice if you want to use those ratios. If only there was some way to move the chain over at the front ...
Forum: Bicycle Mechanics
09-16-24, 05:58 PM
Replies: 15
Views: 344
Posted By grumpus

Build a robust bench, then put wheels on it and...

Build a robust bench, then put wheels on it and call it a trailer.
Forum: Bicycle Mechanics
09-16-24, 05:52 PM
Replies: 7
Views: 225
Posted By grumpus

I think this...

I think this (https://www.bikeforums.net/bicycle-mechanics/1291635-repair-90-s-rapidfire-shifters.html) was the last time we discussed this at length.
Forum: Bicycle Mechanics
09-16-24, 05:45 PM
Replies: 61
Views: 1,718
Posted By grumpus

Use a narrow/wide chainring, use a chain guide or...

Use a narrow/wide chainring, use a chain guide or chain catcher, use chainring guards on both sides of the chainring, replace worn components, go back to multiple chainrings. I have 1x, 2x and 3x...
Forum: Bicycle Mechanics
09-16-24, 04:37 PM
Replies: 13
Views: 354
Posted By grumpus

Retail boxed Shimano cassettes are securely held...

Retail boxed Shimano cassettes are securely held together in the packaging - no chance of anything just slipping out if the box was opened, and even once the plastic wrap comes off the sprockets,...
Forum: Bicycle Mechanics
09-16-24, 02:22 PM
Replies: 15
Views: 298
Posted By grumpus

Measure the hub with a firm-joint external...

Measure the hub with a firm-joint external caliper, then measure that with the digital caliper. 😃
Forum: Bicycle Mechanics
09-16-24, 02:17 PM
Replies: 15
Views: 298
Posted By grumpus

123 mm was a common frame spacing while 126 mm (6...

123 mm was a common frame spacing while 126 mm (6 and 7 speed) hubs were taking over from 120 mm (5 speed) as it allowed the use of either type of wheel.
Forum: Bicycle Mechanics
09-16-24, 02:12 PM
Replies: 15
Views: 298
Posted By grumpus

You don't want to put a washer between the hub...

You don't want to put a washer between the hub and frame, that will reduce its positive location in the dropout. If washers are needed (and for 2 mm difference they're not needed) put them under the...
Forum: Bicycle Mechanics
09-16-24, 10:31 AM
Replies: 38
Views: 1,200
Posted By grumpus

​​​​​​Happy triking. 😃

​​​​​​Happy triking. 😃
Forum: Bicycle Mechanics
09-16-24, 09:46 AM
Replies: 38
Views: 1,200
Posted By grumpus

If you have a couple of sturdy trees handy (or...

If you have a couple of sturdy trees handy (or lamp posts, whatever*) you can tie the front frame to one around the bottom bracket area, the back axle to the other with a tight loop of rope, then put...
Forum: Bicycle Mechanics
09-16-24, 09:13 AM
Replies: 10
Views: 369
Posted By grumpus

The way I deal with twisted spokes is to give an...

The way I deal with twisted spokes is to give an extra quarter turn or so, it varies from wheel to wheel, then back off the same amount to bring it back in line. No need to hold the spoke, which...
Forum: Bicycle Mechanics
09-16-24, 09:01 AM
Replies: 19
Views: 334
Posted By grumpus

That spoke wrench is nasty, it's uncomfortable to...

That spoke wrench is nasty, it's uncomfortable to use and doesn't grip well - I had a similar wrench from VAR which at least was precisely machined in hard steel, to cover odd sizes for which I...
Forum: Bicycle Mechanics
09-16-24, 07:50 AM
Replies: 17
Views: 382
Posted By grumpus

Except someone might later want to raise it to...

Except someone might later want to raise it to full height as indicated by the minimum insertion mark, which is no longer correct.
Forum: Bicycle Mechanics
09-14-24, 09:12 AM
Replies: 15
Views: 340
Posted By grumpus

I don't understand what these points are saying -...

I don't understand what these points are saying - can you elaborate?
Forum: Bicycle Mechanics
09-14-24, 09:07 AM
Replies: 15
Views: 340
Posted By grumpus

That's external bearings on a ISO threaded cup,...

That's external bearings on a ISO threaded cup, to fit a wider spindle than internal bearings allow - typically 24 mm as used by Shimano Hollowtech II
Forum: Bicycle Mechanics
09-14-24, 08:57 AM
Replies: 15
Views: 340
Posted By grumpus

BSA stands for Birmingham Small Arms, originally...

BSA stands for Birmingham Small Arms, originally a gun manufacturer that also made bicycles, motorcycles and other vehicles and industrial parts. BSC stands for British Standard Cycle, referring to...
Forum: Bicycle Mechanics
09-14-24, 07:49 AM
Replies: 20
Views: 739
Posted By grumpus

Some people don't need the Bolivian marching...

Some people don't need the Bolivian marching powder to act so .... enthusiastic.
Forum: Bicycle Mechanics
09-13-24, 12:48 PM
Replies: 4
Views: 251
Posted By grumpus

Use a flanged button head M6 screw and file the...

Use a flanged button head M6 screw and file the flats yourself?
Forum: Bicycle Mechanics
09-13-24, 12:16 PM
Replies: 45
Views: 1,408
Posted By grumpus

Looks like plastic to me - my guess it's an...

Looks like plastic to me - my guess it's an extension to the tyre guide for easy wheel fitting, but designed to wear quickly if the tyre rubs on it, and the outside slot is so you can remove it once...
Forum: Bicycle Mechanics
09-13-24, 12:09 PM
Replies: 45
Views: 1,408
Posted By grumpus

I always assumed it was to stop the block from...

I always assumed it was to stop the block from sliding out of the shoe when you use the brake to stop rolling back on a steep hill, I don't think it would resist full-force braking very effectively.
Forum: Bicycle Mechanics
09-13-24, 11:57 AM
Replies: 7
Views: 277
Posted By grumpus

That's why some top level competitive cyclists...

That's why some top level competitive cyclists employ a domestique to "ride in" their race wheels, while others will do it themselves by riding to the event.
Forum: Bicycle Mechanics
09-13-24, 11:43 AM
Replies: 20
Views: 739
Posted By grumpus

It looked to me, from the short part that I...

It looked to me, from the short part that I watched, like he was off his meds. I'm still not grown up, but having learned over the years I'm a lot more cynical than I was.
Forum: Bicycle Mechanics
09-12-24, 06:03 AM
Replies: 11
Views: 392
Posted By grumpus

That's where the problem lies - mid drives fit...

That's where the problem lies - mid drives fit through and under the bottom bracket shell, if you fit an adaptor to take the OPC shell down to 1.37" the distance to the bottom of the shell will...
Forum: Bicycle Mechanics
09-12-24, 05:05 AM
Replies: 22
Views: 1,648
Posted By grumpus

So you found a years-old post that wasn't...

So you found a years-old post that wasn't actually relevant to your question, yet thought it was helpful to revive it, tacking your own query on the bottom where many people won't see it because they...
Forum: Bicycle Mechanics
09-12-24, 04:33 AM
Replies: 4
Views: 230
Posted By grumpus

4.4 mm according to Park Tool....

4.4 mm according to Park Tool. (https://www.parktool.com/en-int/product/double-ended-spoke-wrench-shimano-sw-14-5)
Forum: Bicycle Mechanics
09-11-24, 02:12 PM
Replies: 22
Views: 1,648
Posted By grumpus

Necropost - the person who revived it is not...

Necropost - the person who revived it is not asking about a Jamis ... why does anyone think it's a good idea to do this?
Forum: Bicycle Mechanics
09-11-24, 01:53 PM
Replies: 20
Views: 739
Posted By grumpus

Lately I find it easier to just stop watching, I...

Lately I find it easier to just stop watching, I don't need to stay to the end before deciding something isn't helpful or entertaining. Occasionally I'll save something to the "watch later" list. I...
Forum: Bicycle Mechanics
09-11-24, 01:09 PM
Replies: 4
Views: 203
Posted By grumpus

I'd just measure the spacing of the other two...

I'd just measure the spacing of the other two rings and replicate that, or go a little wider as chain drop can be a problem. Bear in mind that you're spacing relative to the back of the middle ring...
Forum: Bicycle Mechanics
09-11-24, 12:29 PM
Replies: 24
Views: 573
Posted By grumpus

Indeed (both points). Usually you can tell that...

Indeed (both points). Usually you can tell that the last ball doesn't quite fit, but if in doubt ...
Forum: Bicycle Mechanics
09-11-24, 12:24 PM
Replies: 43
Views: 1,246
Posted By grumpus

Actually ITYF that's the reason for tied &...

Actually ITYF that's the reason for tied & soldered spokes - simply interlacing spokes doesn't stop them from stabbing you in the leg. It does however have the benefit of creating a more torsionally...
Forum: Bicycle Mechanics
09-11-24, 08:54 AM
Replies: 24
Views: 573
Posted By grumpus

He did write "bearings with loose balls are...

He did write "bearings with loose balls are preferable (https://www.sheldonbrown.com/opc.html)", Google can find no trace of "loose balls rule".
Forum: Bicycle Mechanics
09-11-24, 08:30 AM
Replies: 33
Views: 1,039
Posted By grumpus

Nope, although I Iike the anchor idea; it's the...

Nope, although I Iike the anchor idea; it's the only lever for the rear wheel - the regular levers each control one of the front wheels. I've yet to test ride it, I may not keep this arrangement.
Forum: Bicycle Mechanics
09-10-24, 11:17 AM
Replies: 16
Views: 451
Posted By grumpus

Ah OK, there was no evidence of those in your...

Ah OK, there was no evidence of those in your picture. To me the distinctive movement of amber pedal reflectors in my car lights says "bike" more than anything else, although they're contentious as...
Forum: Bicycle Mechanics
09-10-24, 09:18 AM
Replies: 16
Views: 599
Posted By grumpus

Yeah but wear them out or break them first.

Yeah but wear them out or break them first.
Forum: Bicycle Mechanics
09-10-24, 09:17 AM
Replies: 16
Views: 599
Posted By grumpus

Contact points (bar/stem/grips, saddle, pedals)...

Contact points (bar/stem/grips, saddle, pedals) if the current arrangement doesn't suit you. Tyres - the OEM tyres are a lower cost compromise between road and dirt use - for street I'd fit something...
Forum: Bicycle Mechanics
09-10-24, 08:20 AM
Replies: 33
Views: 1,039
Posted By grumpus

I just put one of those on a trike as the parking...

I just put one of those on a trike as the parking brake lever. 😃
Forum: Bicycle Mechanics
09-10-24, 08:10 AM
Replies: 16
Views: 451
Posted By grumpus

Do you not have state law governing bicycle...

Do you not have state law governing bicycle lighting? In Europe they have red lights and reflectors facing only the rear, white facing the front, amber on pedals, amber or white on wheels. This...
Forum: Bicycle Mechanics
09-10-24, 07:36 AM
Replies: 43
Views: 1,246
Posted By grumpus

That's absolutely true with a regular wheel, but...

That's absolutely true with a regular wheel, but with a crazy high spoke count an individual spoke or two will make little difference; easier to go for less precision and more iteration to let...
Forum: Bicycle Mechanics
09-08-24, 01:20 PM
Replies: 82
Views: 2,687
Posted By grumpus

I needed the hint, but it's so obvious once you...

I needed the hint, but it's so obvious once you realise ...
Forum: Bicycle Mechanics
09-08-24, 01:07 PM
Replies: 16
Views: 451
Posted By grumpus

I bought some black Scotchlite 580 (I think,...

I bought some black Scotchlite 580 (I think, could have been 680) to put on some rims, it looked pretty good (in that it looks black and reflects white) although I'm not sure it's as reflective (or...
Forum: Bicycle Mechanics
09-08-24, 11:57 AM
Replies: 43
Views: 1,246
Posted By grumpus

Oh dear, I suppose someone was going to say it...

Oh dear, I suppose someone was going to say it ... 🙄
Forum: Bicycle Mechanics
09-08-24, 10:44 AM
Replies: 11
Views: 343
Posted By grumpus

Most places have somewhere that does shot...

Most places have somewhere that does shot blasting and powder coating, it's the easiest way to get a consistent refinish. Personally I might just get it blasted, then try painting it myself (I used...
Forum: Bicycle Mechanics
09-08-24, 09:58 AM
Replies: 26
Views: 953
Posted By grumpus

The ancients had a thing called "2X" but the...

The ancients had a thing called "2X" but the actual working of the "front derailleur" is lost in the mists of time.
Forum: Bicycle Mechanics
09-08-24, 09:34 AM
Replies: 12
Views: 528
Posted By grumpus

Seriously? I wouldn't rely on those cheap Chinese...

Seriously? I wouldn't rely on those cheap Chinese screws for my safety. I sweat more riding ten miles than I'd save using titanium fasteners. Also, galvanic corrosion.
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