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Search: Posts Made By: grumpus
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
06-03-24, 04:06 PM
Replies: 9
Views: 163
Posted By grumpus

What sort of bike is it?

What sort of bike is it?
Forum: Bicycle Mechanics
06-03-24, 01:55 PM
Replies: 38
Views: 697
Posted By grumpus

A slightly wobbly rim can be trued with all...

A slightly wobbly rim can be trued with all spokes tensioned within tolerances - there won't be any more tendency to go out of true in normal use than with a rim that started perfectly round and...
Forum: Bicycle Mechanics
06-03-24, 11:22 AM
Replies: 13
Views: 183
Posted By grumpus

Perhaps I'm missing something but wouldn't this...

Perhaps I'm missing something but wouldn't this (https://www.amazon.com/Shimano-SM-BBR60-Ultegra-FC-CX70-Hollowtech/dp/B00CABINCY/) do the job?
Forum: Bicycle Mechanics
06-03-24, 11:01 AM
Replies: 4
Views: 147
Posted By grumpus

Yes, but probably not as often as a regular bike....

Yes, but probably not as often as a regular bike. Assuming your trike is a tadpole, the chain doesn't get water and road dirt thrown at it by the front wheel like on a regular bike, also your chain...
Forum: Bicycle Mechanics
06-03-24, 10:09 AM
Replies: 38
Views: 697
Posted By grumpus

I like something you can hear, rather than having...

I like something you can hear, rather than having to look at the gap. Just replacing a brake block with a bolt and two nuts is good. For runout a 10 mm wrench and rubber band or a couple of zip ties....
Forum: Bicycle Mechanics
06-03-24, 09:43 AM
Replies: 38
Views: 697
Posted By grumpus

I wish I'd done that before one of my recent...

I wish I'd done that before one of my recent rebuilds, but I forgot. I knew the rim had been battered, looked like it had hit a rock in a muddy field, but once I'd straightened the sidewalls I forgot...
Forum: Bicycle Mechanics
06-02-24, 10:19 AM
Replies: 22
Views: 701
Posted By grumpus

Here are all the relevant measurements for disc...

Here are all the relevant measurements for disc caliper mounts on forks
http://www.peterverdone.com/wp-content/uploads/2018/06/2019-Shimano-Disc-Brake-Standards.pdf
where you can see that the inner...
Forum: Bicycle Mechanics
06-02-24, 09:44 AM
Replies: 6
Views: 184
Posted By grumpus

It depends how you ride - 30/36 on 700C at 80 rpm...

It depends how you ride - 30/36 on 700C at 80 rpm is about 5 mph, you might want to go lower. I'd more likely be doing 50 rpm which is 3 mph, any lower I might as well get off and push.
Forum: Bicycle Mechanics
06-02-24, 09:24 AM
Replies: 2
Views: 165
Posted By grumpus

Not an adaptor as such, you need an Italian...

Not an adaptor as such, you need an Italian threaded bottom bracket bearing assembly that will match the chainline and interface of whatever you want to put on it.
Forum: Bicycle Mechanics
06-01-24, 11:57 PM
Replies: 6
Views: 261
Posted By grumpus

Ow!

Ow!
Forum: Bicycle Mechanics
06-01-24, 10:10 PM
Replies: 21
Views: 463
Posted By grumpus

I tend to buy used rigid forks on eBay to replace...

I tend to buy used rigid forks on eBay to replace junk suspension forks. You probably don't need to worry about "suspension correction" for a short travel fork, could go either way.
Forum: Bicycle Mechanics
06-01-24, 09:39 PM
Replies: 11
Views: 494
Posted By grumpus

One of my favourite things is using a screwdriver...

One of my favourite things is using a screwdriver like a lathe tool (while turning the crank, in tne work stand) to remove dried up crud from derailleur pulleys. So satisfying, so stupid, so much...
Forum: Bicycle Mechanics
05-31-24, 11:44 AM
Replies: 23
Views: 705
Posted By grumpus

A picture of your derailleur might help us figure...

A picture of your derailleur might help us figure out what this means.
Forum: Bicycle Mechanics
05-30-24, 08:31 PM
Replies: 35
Views: 17,625
Posted By grumpus

I used to undo and tie back the surrounding 4 to...

I used to undo and tie back the surrounding 4 to 6 spokes then, holding the wheel with one hand, whack the rim with a rubber hammer. A bit too far is preferable to not quite far enough when you get...
Forum: Bicycle Mechanics
05-30-24, 12:13 PM
Replies: 16
Views: 455
Posted By grumpus

Posters often seem so eager to reply that they...

Posters often seem so eager to reply that they don't finish reading the thread, either that or their reading and comprehension are poor. Someone already suggested the stem, I'm afraid I have nothing...
Forum: Bicycle Mechanics
05-30-24, 11:47 AM
Replies: 21
Views: 463
Posted By grumpus

It looks like there's movement at the fork crown,...

It looks like there's movement at the fork crown, if it's not the headset then it is likely to be where the steerer or stanchions attach to the crown. But then it looks like the legs are loose on the...
Forum: Bicycle Mechanics
05-30-24, 11:33 AM
Replies: 5
Views: 231
Posted By grumpus

Any chain lube that is described as "wet" or "all...

Any chain lube that is described as "wet" or "all weather" will form a protective layer, you can use it as a general lubricant and protector on other parts too. I use Finish Line Wet. Sharkhide seems...
Forum: Bicycle Mechanics
05-28-24, 09:25 AM
Replies: 10
Views: 2,079
Posted By grumpus

Well yes, that's SOP for "a regular threadless...

Well yes, that's SOP for "a regular threadless headset".
Forum: Bicycle Mechanics
05-28-24, 08:59 AM
Replies: 10
Views: 318
Posted By grumpus

Portugal according to his profile.

Portugal according to his profile.
Forum: Bicycle Mechanics
05-28-24, 07:59 AM
Replies: 6
Views: 207
Posted By grumpus

Could try it with a derailleur hanger extender,...

Could try it with a derailleur hanger extender, but shifting quality would likely suffer.
Forum: Bicycle Mechanics
05-28-24, 07:41 AM
Replies: 21
Views: 559
Posted By grumpus

Here's a link to some 40-584: ...

Here's a link to some 40-584:
https://www.amazon.com/Gravel-Tires-Terra-Sidewall-Protection/dp/B08KWLVHLN/
Forum: Bicycle Mechanics
05-28-24, 07:20 AM
Replies: 10
Views: 318
Posted By grumpus

I'd try eBay. Note that Xenon was available in 9...

I'd try eBay. Note that Xenon was available in 9 and 10 speed.
Forum: Bicycle Mechanics
05-28-24, 07:07 AM
Replies: 10
Views: 2,079
Posted By grumpus

Or setting this up as a regular threadless...

Or setting this up as a regular threadless headset - just screw the top race all the way into the clamp, apply preload using the stem, star nut and top cap, then tighten the pinch bolts in the clamp...
Forum: Bicycle Mechanics
05-28-24, 06:50 AM
Replies: 7
Views: 254
Posted By grumpus

You dish the wheel according to the spacing as it...

You dish the wheel according to the spacing as it is now, not how it used to be. I wonder if there's some confusion with the terminology. If you add spacers to the NDS you have to move the rim toward...
Forum: Bicycle Mechanics
05-27-24, 01:41 PM
Replies: 81
Views: 2,110
Posted By grumpus

That's OK, I wasn't trying to sell the idea.

That's OK, I wasn't trying to sell the idea.
Forum: Bicycle Mechanics
05-27-24, 11:38 AM
Replies: 13
Views: 404
Posted By grumpus

Depends on the type of steel - your basic stuff...

Depends on the type of steel - your basic stuff is easy to bend and pretty easy to straighten, higher quality steel is harder to bend, harder to straighten and more likely to crack. Also depends on...
Forum: Bicycle Mechanics
05-26-24, 02:20 PM
Replies: 81
Views: 2,110
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: 81
Views: 2,110
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: 81
Views: 2,110
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: 25
Views: 13,100
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: 10
Views: 350
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: 81
Views: 2,110
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: 81
Views: 2,110
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: 21
Views: 559
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: 26
Views: 692
Posted By grumpus

Extra layers of rim tape?

Extra layers of rim tape?
Forum: Folding Bikes
05-25-24, 06:51 PM
Replies: 51
Views: 2,363
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: 284
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: 284
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: 37
Views: 1,468
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: 23
Views: 646
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: 37
Views: 1,468
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: 246
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: 564
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: 523
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: 22
Views: 701
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: 208
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: 245
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: 29
Views: 809
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: 416
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: 22
Views: 701
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...
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