Search found 192 matches

by Chris Jeggo
2 Jan 2019, 3:58pm
Forum: Bikes & Bits – Technical section
Topic: 9 speed cassette: 12-36. Too spaced out for front double?
Replies: 40
Views: 2668

Re: 9 speed cassette: 12-36. Too spaced out for front double?

... I've ridden behind and studied the gearing use of people who advocate closely spaced gears and they don't shift any more often than I do. Rather than use the fine tuning as they claim, to maintain a constant cadence, what they actually seem to want this for is a closely-spaced selection of 'jus...
by Chris Jeggo
27 Dec 2018, 3:49pm
Forum: Bikes & Bits – Technical section
Topic: 9 speed cassette: 12-36. Too spaced out for front double?
Replies: 40
Views: 2668

Re: 9 speed cassette: 12-36. Too spaced out for front double?

My modern touring bike has 3x9 gearing, 42-32-22 and the 12-36 cassette you ask about. It all works fine, giving me suitable gears for day rides and low enough ones for, for example, an unsupported tour of the Pyrenees, going over TdF cols such as the Aubisque and Tourmalet with a pair of panniers a...
by Chris Jeggo
22 Dec 2018, 6:55pm
Forum: Bikes & Bits – Technical section
Topic: Plus Ca Change...
Replies: 95
Views: 3464

Re: Plus Ca Change...

... Like I said upthread, you come from the 1%, ... ... Quite the opposite. A bit cheeky! More than a bit cheeky. No manners. what a load of twaddle. ... +1 to twaddle. ... the vast majority of 'regular' cyclists who take part in Sportives and club cycling are a small subset of the vast majority of...
by Chris Jeggo
18 Dec 2018, 2:44pm
Forum: Bikes & Bits – Technical section
Topic: Specialized plug and play fender (a.k.a. mudguard) rattle
Replies: 5
Views: 841

Re: Specialized plug and play fender (a.k.a. mudguard) rattle

How about fitting a seat-stay bridge clip to the mudguard and threading a cable tie through the brake-bolt hole of the clip and round the stays. Probably best to thread the cable tie through the clip twice, once in each direction, to finish up with a symmetrical arrangement. Still a bit Heath Robins...
by Chris Jeggo
13 Dec 2018, 4:31pm
Forum: Bikes & Bits – Technical section
Topic: Why you need aero wheels
Replies: 91
Views: 3960

Re: Why you need aero wheels

AIUI, tennis balls are fluffy and golf balls are dimpled to make them go faster. Its to do with separation of the boundary layer. I would find it very easy to believe that hairy legs are faster than shaved ones. OTOH, if I squandered some of my unbelievable wealth on the services of a masseuse in or...
by Chris Jeggo
5 Dec 2018, 2:42pm
Forum: Bikes & Bits – Technical section
Topic: Occasional chain suck - new components
Replies: 20
Views: 808

Re: Occasional chain suck - new components

I had bad chainsuck on a 26T steel inner on a triple (eventually found it was producing burrs where the teeth deformed slightly under pressure - even after filing them off they formed again so it wasn't a one off event). I had this too. After I filed off the burrs for the second or third time the p...
by Chris Jeggo
2 Dec 2018, 6:31pm
Forum: Bikes & Bits – Technical section
Topic: Double VS triple. Sheldon gears say 1.9 VS 1.8. Comparable?
Replies: 15
Views: 722

Re: Double VS triple. Sheldon gears say 1.9 VS 1.8. Comparable?

Valbrona wrote:I want four chainrings.

Old hat. Velocio built a bike with four chainrings over 100 years ago. There were two on each side, also two chains and two sprockets on each side, with gear selection by clutches.
by Chris Jeggo
2 Dec 2018, 5:10pm
Forum: Bikes & Bits – Technical section
Topic: Double VS triple. Sheldon gears say 1.9 VS 1.8. Comparable?
Replies: 15
Views: 722

Re: Double VS triple. Sheldon gears say 1.9 VS 1.8. Comparable?

On my elderly Roberts touring bike with a Stronglight Impact chainset I used to have a triple: 46-34-24t, but I found myself changing between outer and middle rings too often, so I removed the outer and changed the middle to a 40t (which remained aligned with the centre sprocket of my 9-speed 11-34t...
by Chris Jeggo
13 Nov 2018, 4:58pm
Forum: Bikes & Bits – Technical section
Topic: Disc brakes pulling trike to one side
Replies: 18
Views: 758

Re: Disc brakes pulling trike to one side

Only last weekend I fixed the front brakes on an 'Auntie' Rover 100 belonging to a friend. Braking caused a sharp pull to the right. The cause - leaking seals in the left hand caliper. You may claim that wasn't the cause but all I know is that after I fitted new seals it pulled up in a straight lin...
by Chris Jeggo
13 Nov 2018, 1:46am
Forum: Bikes & Bits – Technical section
Topic: Disc brakes pulling trike to one side
Replies: 18
Views: 758

Re: Disc brakes pulling trike to one side

Only last weekend I fixed the front brakes on an 'Auntie' Rover 100 belonging to a friend. Braking caused a sharp pull to the right. The cause - leaking seals in the left hand caliper. You may claim that wasn't the cause but all I know is that after I fitted new seals it pulled up in a straight lin...
by Chris Jeggo
13 Nov 2018, 12:52am
Forum: Bikes & Bits – Technical section
Topic: shimano 7 & 8 sp sprocket spacing
Replies: 10
Views: 444

Re: shimano 7 & 8 sp sprocket spacing


So it is; hadn't come across that. Thanks, Brucey.

Chris
by Chris Jeggo
12 Nov 2018, 5:06pm
Forum: Bikes & Bits – Technical section
Topic: shimano 7 & 8 sp sprocket spacing
Replies: 10
Views: 444

Re: shimano 7 & 8 sp sprocket spacing

All the information you need about freewheel and cassette spacings etc is here:
https://www.sheldonbrown.com/cribsheet-spacing.html
by Chris Jeggo
29 Oct 2018, 3:01pm
Forum: Bikes & Bits – Technical section
Topic: Tourer - 26" or 700c wheel?
Replies: 63
Views: 2639

Re: Tourer - 26" or 700c wheel?

Getting confused again. :-) ... I am going somewhere quiet for a lie down. The CUK guide to tyre sizing is here , and Sheldon Brown has something similar. When mountain bikers started fitting fat tyres (fatter than 'C') to '700C' (i.e. ISO 622 BSD) rims they got a wheel larger than the nominal 700m...
by Chris Jeggo
29 Oct 2018, 2:23pm
Forum: Bikes & Bits – Technical section
Topic: Tourer - 26" or 700c wheel?
Replies: 63
Views: 2639

Re: Tourer - 26" or 700c wheel?

Thanks for your take on it, Brucey.
by Chris Jeggo
29 Oct 2018, 10:20am
Forum: Bikes & Bits – Technical section
Topic: Alpine double
Replies: 48
Views: 2460

Re: Alpine double

It is worse with small chainrings; the reason is twofold, I think; 1) the chain tension is higher for any given pedal pressure (causing more rapid hooking wear) and 2) the chain wrap on the chainring is shorter. On the latter point with a 26T chainring there are only ~13 links in mesh with the chai...