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Search: Posts Made By: grumpus
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
06-15-24, 12:12 PM
Replies: 12
Views: 145
Posted By grumpus

Make sure the bike fits - buying kids oversized...

Make sure the bike fits - buying kids oversized bikes for them to "grow into" meant that they often couldn't easily reach the proper levers. That combined with poorly adjusted brakes made the "safety...
Forum: Bicycle Mechanics
06-13-24, 04:35 PM
Replies: 86
Views: 3,951
Posted By grumpus

Cross-chaining is running big/big or small/small...

Cross-chaining is running big/big or small/small and similar gears, where the chain is running at a significant angle to the chainring/sprocket - this is inefficient and/or increases wear and/or...
Forum: Bicycle Mechanics
06-13-24, 12:31 PM
Replies: 8
Views: 228
Posted By grumpus

I thought I'd read elsewhere that Formula are...

I thought I'd read elsewhere that Formula are responsive to this sort of tech query.
Forum: Bicycle Mechanics
06-13-24, 12:24 PM
Replies: 8
Views: 197
Posted By grumpus

I could live with one of those, the gray one, if...

I could live with one of those, the gray one, if I was into modern stuff and spending money.
Forum: Bicycle Mechanics
06-13-24, 11:44 AM
Replies: 6
Views: 173
Posted By grumpus

You'll probably be wanting something like this ...

You'll probably be wanting something like this
https://www.spacycles.co.uk/m8b0s109p2830/
and the appropriate square taper bottom bracket, because most mainstream cranks aren't available in less...
Forum: Bicycle Mechanics
06-11-24, 02:01 PM
Replies: 6
Views: 213
Posted By grumpus

The easiest way to find the size you need is to...

The easiest way to find the size you need is to remove the existing unit, it will usually have the size written on it. If not you have to measure the length of the axle and the width of the bottom...
Forum: Bicycle Mechanics
06-11-24, 01:36 PM
Replies: 7
Views: 282
Posted By grumpus

This one probably was M5x0.8 before someone...

This one probably was M5x0.8 before someone messed it up.
Forum: Bicycle Mechanics
06-11-24, 01:27 PM
Replies: 67
Views: 1,943
Posted By grumpus

So don't force it into tight curves.

So don't force it into tight curves.
Forum: Bicycle Mechanics
06-10-24, 08:24 PM
Replies: 14
Views: 290
Posted By grumpus

Paint repairs that try to be invisible but aren't...

Paint repairs that try to be invisible but aren't tend to look a bit rubbish, I'm inclined to apply a rust stabiliser and then clearcoat, or just keep it oiled. Very fine steel wool 0000 grade is...
Forum: Bicycle Mechanics
06-10-24, 06:41 PM
Replies: 13
Views: 651
Posted By grumpus

I remember those - they seem very suitable for 3D...

I remember those - they seem very suitable for 3D printing.
Forum: Bicycle Mechanics
06-08-24, 09:05 AM
Replies: 64
Views: 2,010
Posted By grumpus

Never heard of thread drift?

Never heard of thread drift?
Forum: Bicycle Mechanics
06-08-24, 09:02 AM
Replies: 26
Views: 783
Posted By grumpus

The rotor supposedly accumulates fine deposits of...

The rotor supposedly accumulates fine deposits of friction material, which is why a new rotor has to be conditioned. So I guess you need to clean thoroughly enough to remove those deposits. Some...
Forum: Bicycle Mechanics
06-08-24, 08:48 AM
Replies: 16
Views: 514
Posted By grumpus

Unior makes a cheaper one, it would be easy to...

Unior makes a cheaper one, it would be easy to DIY too - after all it's just a flat bar and a bit of chain.
Forum: Bicycle Mechanics
06-08-24, 08:38 AM
Replies: 5
Views: 267
Posted By grumpus

Quite likely the spacing is designed to suit both...

Quite likely the spacing is designed to suit both 126 and 130 mm hubs.
Forum: Bicycle Mechanics
06-08-24, 08:33 AM
Replies: 6
Views: 290
Posted By grumpus

If you don't find anything locally Ali Express is...

If you don't find anything locally Ali Express is a good source of cheap narrow-wide 110 chainrings (no N/W benefit with an IGH but no downside either). Like $12 including tax, shipping and a set of...
Forum: Bicycle Mechanics
06-08-24, 08:22 AM
Replies: 21
Views: 575
Posted By grumpus

And fit an effective rear mudguard. Is 2 mm big...

And fit an effective rear mudguard. Is 2 mm big enough? I'd expect surface tension to stop water draining through such a small hole.
Forum: Bicycle Mechanics
06-08-24, 08:16 AM
Replies: 67
Views: 1,943
Posted By grumpus

You need to qualify that - in the wet a patch of...

You need to qualify that - in the wet a patch of leaves or some ironwork is all it takes to slide the front wheel under braking, and won't put the rider over the handlebar.
Forum: Bicycle Mechanics
06-08-24, 08:09 AM
Replies: 35
Views: 1,114
Posted By grumpus

I'd be the guy with a spare tube in his pocket.

I'd be the guy with a spare tube in his pocket.
Forum: Bicycle Mechanics
06-08-24, 08:04 AM
Replies: 86
Views: 3,951
Posted By grumpus

A quick Google suggests that your bike has RX100...

A quick Google suggests that your bike has RX100 rear derailleur which can handle 12/28 cassette and 28t total. The cassette (and chain) would be the easiest cheapest upgrade, moving from 23 to 28 is...
Forum: Bicycle Mechanics
06-07-24, 04:56 PM
Replies: 35
Views: 1,114
Posted By grumpus

Whatever forum I'm in, my utility knife blade...

Whatever forum I'm in, my utility knife blade won't retract itself. 😁 (Trying to think of some bike-specific application for carpet: lining a trailer, quietening an indoor trainer, stopping cans (or...
Forum: Bicycle Mechanics
06-07-24, 11:37 AM
Replies: 16
Views: 1,378
Posted By grumpus

Known problem or random failure? I doubt Shimano...

Known problem or random failure? I doubt Shimano would advertise the former, given their recent track record.
Forum: Bicycle Mechanics
06-07-24, 11:26 AM
Replies: 35
Views: 1,114
Posted By grumpus

I don't like the retractable blades, they too...

I don't like the retractable blades, they too often retract themselves when you're cutting something tough like some carpets, I like a lockback:...
Forum: Bicycle Mechanics
06-07-24, 09:56 AM
Replies: 64
Views: 2,010
Posted By grumpus

My favourite kitchen knife was brilliant, good...

My favourite kitchen knife was brilliant, good balance, nice flex and held a very sharp edge. One day I dropped it on a mat over a tiled floor, it landed butt first and the blade broke in half before...
Forum: Bicycle Mechanics
06-07-24, 09:36 AM
Replies: 16
Views: 514
Posted By grumpus

The symptoms clearly show that the middle...

The symptoms clearly show that the middle cassette sprockets are too worn. Incorrect chain length and derailleur adjustment are never the cause of skipping, although they can contribute to chain suck...
Forum: Bicycle Mechanics
06-07-24, 08:26 AM
Replies: 14
Views: 354
Posted By grumpus

I've had the same thing happen: new tyre, first...

I've had the same thing happen: new tyre, first ride and something cut it, in my case through the threads too. I patched it and finished the ride, but the tyre was distorted so it went in the trash....
Forum: Bicycle Mechanics
06-06-24, 01:22 PM
Replies: 14
Views: 354
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: 35
Views: 1,114
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: 49
Views: 10,465
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: 67
Views: 1,943
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: 67
Views: 1,943
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: 156
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: 1,627
Posted By grumpus

Bike Forums

Bike Forums
Forum: Bicycle Mechanics
06-04-24, 06:04 PM
Replies: 38
Views: 1,064
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: 25
Views: 637
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: 38
Views: 1,064
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: 49
Views: 10,465
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: 38
Views: 1,064
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: 64
Views: 2,010
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: 371
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: 333
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: 64
Views: 2,010
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: 64
Views: 2,010
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: 863
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: 227
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: 215
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: 314
Posted By grumpus

Ow!

Ow!
Forum: Bicycle Mechanics
06-01-24, 10:10 PM
Replies: 21
Views: 579
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: 746
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: 852
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: 17,847
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...
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