Search found 146 matches

by Chris Jeggo
12 Nov 2019, 8:38pm
Forum: Bikes & Bits – Technical section
Topic: Is this (disc brake adapter) going to be OK like this?
Replies: 13
Views: 609

Re: Is this (disc brake adapter) going to be OK like this?

If so, skidding a high-grip tyre on a high-grip surface is the worst case for the fork to withstand. Can't do it, not on a solo anyway. You'll go over the bars first. You can do it, but only for a split second before you go over the bars. You'd let go of the lever PDQ! [solos only] In general, &quo...
by Chris Jeggo
12 Nov 2019, 6:01pm
Forum: Bikes & Bits – Technical section
Topic: Is this (disc brake adapter) going to be OK like this?
Replies: 13
Views: 609

Re: Is this (disc brake adapter) going to be OK like this?

Am I right in thinking the torque on the fork is limited to the maximum torque the road exerts on the wheel? If so, skidding a high-grip tyre on a high-grip surface is the worst case for the fork to withstand. Edit: I've just realised that it's not quite as simple as that. Caliper brakes exert a tor...
by Chris Jeggo
9 Nov 2019, 4:46pm
Forum: Bikes & Bits – Technical section
Topic: Tyre wear - mileages
Replies: 30
Views: 754

Re: Tyre wear - mileages

One cause of tyre wear is rubbing contact between tyre and road, because arc length and chord length between two points on the circumference are not the same. Can you expand on this a bit? How do you define rubbing contact? How does the difference in arc to chord length affect the rubbing contact? ...
by Chris Jeggo
9 Nov 2019, 2:22pm
Forum: Bikes & Bits – Technical section
Topic: Tyre wear - mileages
Replies: 30
Views: 754

Re: Tyre wear - mileages

One cause of tyre wear is rubbing contact between tyre and road, because arc length and chord length between two points on the circumference are not the same. If the two tyres (Moulton and Mercian) are the same width and running at the same pressure then the lengths of the footprints will be roughly...
by Chris Jeggo
8 Nov 2019, 11:24am
Forum: Bikes & Bits – Technical section
Topic: Python Paragon gear change problems
Replies: 16
Views: 429

Re: Python Paragon gear change problems

As both Brucey and reohn2 have said, the cable should be slack when low gear is selected, and it clearly isn't. Try winding the L screw back in a couple of turns, and then getting the cable slack but without a lot of slop. Then get the L-screw right, if possible, followed by final adjustment of the ...
by Chris Jeggo
5 Nov 2019, 11:47am
Forum: Bikes & Bits – Technical section
Topic: Tyre/wheel sizes
Replies: 21
Views: 638

Re: Tyre/wheel sizes

Brucey has mentioned ISO bead seat diameters of 584 and 590 above. These sizes were common in the UK for many years, but under another name. 26" wheels were in the majority, and their overall diameter, including the tyre, was pretty close to that nominal 26". The two common sizes were 26 ...
by Chris Jeggo
4 Nov 2019, 9:54pm
Forum: Bikes & Bits – Technical section
Topic: Tyre/wheel sizes
Replies: 21
Views: 638

Re: Tyre/wheel sizes

Brucey has mentioned ISO bead seat diameters of 584 and 590 above. These sizes were common in the UK for many years, but under another name. 26" wheels were in the majority, and their overall diameter, including the tyre, was pretty close to that nominal 26". The two common sizes were 26 x...
by Chris Jeggo
4 Nov 2019, 1:29pm
Forum: Bikes & Bits – Technical section
Topic: Tyre/wheel sizes
Replies: 21
Views: 638

Re: Tyre/wheel sizes

Yes, rubbery worms, some smooth, some knobbly. Yes, as Brucey says. In addition, there is a table of not-too-uncommon tyre sizes and their multifarious markings at https://www.cyclinguk.org/cyclists-library/components/wheels-tyres/tyre-sizes , but note that some entries like 13/8 should be read as 1...
by Chris Jeggo
28 Oct 2019, 3:55pm
Forum: Bikes & Bits – Technical section
Topic: Wobbly Bike
Replies: 6
Views: 513

Re: Wobbly Bike

A wheel can be thought of as having five components: 1) an axle, which should be securely held in the cycle frame; 2) the rest of the hub; 3) a rim; 4) spokes connecting rim to hub; and 5) tyre and tube. Any of these can be responsible for wobbliness. If there was no wobble before you changed the ty...
by Chris Jeggo
29 Sep 2019, 1:47am
Forum: Does anyone know … ?
Topic: Initialisms
Replies: 47
Views: 1535

Re: Initialisms

I think some dictionaries are starting to include the 'wrong' meaning of the word acronym, because it is so widespread. Without acronym we wouldn't have bacronym… cheers No, they aren't wrong, dictionaries themselves change with popular use/acceptance in modern language, thus they are correct in ch...
by Chris Jeggo
29 Sep 2019, 1:27am
Forum: Does anyone know … ?
Topic: Initialisms
Replies: 47
Views: 1535

Re: Initialisms

STD used to mean something to do with telephones, now it is a nasty itch. Whereas std, often means standard. That STD has now morphed to STI, which is still a nasty itch .... to, er, spend money on handlebar bling? TLA = three-letter abbreviation , BTW. The 'onym' of acronym comes from the Greek fo...
by Chris Jeggo
28 Sep 2019, 1:22am
Forum: Does anyone know … ?
Topic: Vintage Bicycle Advertisements; good, bad. ugly...
Replies: 557
Views: 18510

Re: Vintage Bicycle Advertisements; good, bad. ugly...

Mick F wrote:
Brucey wrote:Black and Decker drills like that are often still going ...................
Got one!

Me too, and it's still going!
by Chris Jeggo
28 Sep 2019, 1:09am
Forum: Does anyone know … ?
Topic: Front light positition
Replies: 61
Views: 1642

Re: Front light positition

The headtube is not a good idea because in generations past riders routinely used capes in the rain, some still do, and in other countries it is common amongst utility riders. it would also preclude the use of bar bags or wicker baskets for example. Perhaps this is why it used to be common on conti...
by Chris Jeggo
14 Sep 2019, 1:04am
Forum: Bikes & Bits – Technical section
Topic: Cantilever brakes ..... HELP !!!
Replies: 70
Views: 2311

Re: Cantilever brakes ..... HELP !!!

Sheldon Brown's analysis is not correct - see Chris Juden's:
https://forum.cyclinguk.org/viewtopic.php?f=5&t=57410#p481693
by Chris Jeggo
26 Aug 2019, 3:41pm
Forum: Bikes & Bits – Technical section
Topic: Chainsets
Replies: 29
Views: 1514

Re: Chainsets

That is pretty much what I have on my Roberts: 40t chainwheel aligned with cassette centre, 24t inner ring, 11-34t cassette. It works. I use outer ring on 13t to 30t sprockets most of the time.