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Search: Posts Made By: grumpus
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
06-06-24, 01:22 PM
Replies: 11
Views: 162
Posted By grumpus

Looks like something sharp has taken a very...

Looks like something sharp has taken a very shallow slice out of the rubber. I'd deflate the tyre and pinch it so I can see that there are no cut threads visible deep in the cut - hopefully no...
Forum: Bicycle Mechanics
06-06-24, 12:52 PM
Replies: 13
Views: 138
Posted By grumpus

Antique tailor's shears (which are really just...

Antique tailor's shears (which are really just large high quality scissors). A rotary cutter, cutting mat and straight edge for cutting strips.
Forum: Bicycle Mechanics
06-06-24, 08:34 AM
Replies: 46
Views: 10,024
Posted By grumpus

Turns out they're mostly just hollow ground, the...

Turns out they're mostly just hollow ground, the 10 mm measures about 9.95 mm across the edges and 9.75 mm in the middle of the faces. This isn't what I was expecting from the drawings.
Forum: Bicycle Mechanics
06-05-24, 06:03 PM
Replies: 32
Views: 416
Posted By grumpus

Standard 6 bolt rotors are 44 mm bcd, there have...

Standard 6 bolt rotors are 44 mm bcd, there have been other hubs/rotors using 4, 5 or 6 bolts.
TRP Spyke or Spyre (MTB and road respectively) are good calipers if you can find them.
Forum: Bicycle Mechanics
06-05-24, 05:20 PM
Replies: 32
Views: 416
Posted By grumpus

That's simply not true, good cable operated disc...

That's simply not true, good cable operated disc brakes have no problem stopping a bike. Hydraulics have the benefit of being self-adjusting, and no cable friction, so cable systems need more...
Forum: Bicycle Mechanics
06-05-24, 04:43 PM
Replies: 5
Views: 107
Posted By grumpus

No OEM part number because Chevy didn't put new...

No OEM part number because Chevy didn't put new motors in old cars, but an eBay listing says Hughes HP3795, ALL26121, Speedway Motors 57518346, ICT Billet 551165, Hays 41-202
Forum: Bicycle Mechanics
06-04-24, 06:13 PM
Replies: 42
Views: 1,467
Posted By grumpus

Bike Forums

Bike Forums
Forum: Bicycle Mechanics
06-04-24, 06:04 PM
Replies: 37
Views: 793
Posted By grumpus

Sachs internal gear hubs haven't been made for a...

Sachs internal gear hubs haven't been made for a while, spares aren't easy to find, you might find the shop wants to sell you a new wheel rather than fix this one.
Forum: Bicycle Mechanics
06-04-24, 11:11 AM
Replies: 21
Views: 339
Posted By grumpus

It's the thickness of the teeth and the thickness...

It's the thickness of the teeth and the thickness of the arms they bolt to that have to work with your chain and front derailleur, but there seems to be a fair amount of wiggle room between different...
Forum: Bicycle Mechanics
06-04-24, 11:05 AM
Replies: 37
Views: 793
Posted By grumpus

Anything steady that you can hook the nose of the...

Anything steady that you can hook the nose of the saddle over to hold the bike so you don't have to bend down. But it's not necessary, just convenient. Maybe there's something like a fire escape. One...
Forum: Bicycle Mechanics
06-04-24, 10:31 AM
Replies: 46
Views: 10,024
Posted By grumpus

Looks like the hex plus is designed so that more...

Looks like the hex plus is designed so that more than just the corner makes contact after initial wind-in - the corners are wider than 120° so they look like they have been pushed back, allowing more...
Forum: Bicycle Mechanics
06-03-24, 04:06 PM
Replies: 37
Views: 793
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: 44
Views: 1,002
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: 18
Views: 276
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: 8
Views: 268
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: 44
Views: 1,002
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: 44
Views: 1,002
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: 23
Views: 778
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: 205
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: 190
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: 283
Posted By grumpus

Ow!

Ow!
Forum: Bicycle Mechanics
06-01-24, 10:10 PM
Replies: 21
Views: 481
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: 13
Views: 653
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: 735
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: 17,685
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: 18
Views: 533
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: 481
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: 251
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: 2,085
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: 338
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: 211
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: 571
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: 338
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: 2,085
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: 279
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: 2,185
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: 431
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: 2,185
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: 2,185
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: 2,185
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: 13,129
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: 360
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: 2,185
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: 2,185
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: 571
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: 728
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: 2,420
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: 305
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: 305
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: 1,555
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.
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