Search found 114 matches

by james-o
7 Aug 2016, 9:19am
Forum: Bikes & Bits – Technical section
Topic: What is the "centre of steering"?
Replies: 34
Views: 1892

Re: What is the "centre of steering"?

One of Thorn's great admonitions against short stems is that they might put the rider's hands behind the "centre of steering" thus causing an uncontrollable wobble or shimmy. Only if the bike is inclined to shimmy in the first place. Colin's points are right re shimmy, I'd say. It's a res...
by james-o
7 Aug 2016, 8:57am
Forum: Bikes & Bits – Technical section
Topic: B&M 'USB-Werks" + Garmin 1000 + B&M IQ-X
Replies: 5
Views: 663

Re: B&M 'USB-Werks" + Garmin 1000 + B&M IQ-X

I have a USB-Werk and an SON front light with a Garmin 800, so a different set up but fwiw - the Garmin 800 has a 2000-2200mah batterey as far as I know. It charges in about 3hrs of ~14mph average pace road riding (estimate from experience rather than a calc. I then leave it plugged in mostly as onc...
by james-o
19 Mar 2016, 10:28am
Forum: Bikes & Bits – Technical section
Topic: FRAME STIFFNESS
Replies: 79
Views: 4150

Re: FRAME STIFFNESS

Colin, imo you're bob-on re the head tube, TT and DT shaping in your first post. We did the same things with 'XX44' head sets and head tubes when I 'designed' (I like your use of inverted commas there, I agree, most of us specify frames, design is a stretch and over-used in the industry imo) the Gen...
by james-o
21 Feb 2016, 11:32am
Forum: Bikes & Bits – Technical section
Topic: Carbon fibre disk brake touring fork
Replies: 41
Views: 2337

Re: Carbon fibre disk brake touring fork

I'd agree with a lot of that Brucey. Commuting on salty or oily roads can make a joke of a disc pad pretty fast, the main con vs the generally weaker but predictably so performance of rim brakes in the wet. I've never found discs an issue with upsetting my balance on the bike, the power's there but ...
by james-o
21 Feb 2016, 9:26am
Forum: Bikes & Bits – Technical section
Topic: Carbon fibre disk brake touring fork
Replies: 41
Views: 2337

Re: Carbon fibre disk brake touring fork

Disc brakes have their plusses and minuses, but for most of the winter there is no real benefit in terms of braking performance because that is limited by the grip of the tyre on the (wet, muddy, icy) road anyway. For someone with your technical experience I'm suprised to read that. That point has ...
by james-o
8 Sep 2015, 9:07am
Forum: Bikes & Bits – Technical section
Topic: 10 reasons to dislike drop/road bars :P
Replies: 123
Views: 10102

Re: 10 reasons to dislike drop/road bars :P

http://cdn2.bigcommerce.com/n-d57o0b/6jcqg/product_images/uploaded_images/hbar-positions-anim-v2.gif?t=1417710769 Jones 'H' bar. Very useful fore-aft position variation. Depending what gear shifter is used, I can cover the brake with my 2 outer fingers from a narrow+fwd position and from the rear i...
by james-o
6 Sep 2015, 10:08am
Forum: Bikes & Bits – Technical section
Topic: 10 reasons to dislike drop/road bars :P
Replies: 123
Views: 10102

Re: 10 reasons to dislike drop/road bars :P

Interesting topic. I love as well as hate drop bars. I love how they work on a ' proper' road bike yet I don't want to be limited to tarmac on my 'road' bike. I find drop bars challenging at best for riding off-road, at least any riding that's not pootling. I know John Tomac rode like a man posessed...
by james-o
27 Jun 2015, 4:59pm
Forum: Bikes & Bits – Technical section
Topic: Effect of bottom-bracket height
Replies: 17
Views: 2657

Re: Effect of bottom-bracket height

Yes 25 deg lean angle from the vertical, as the minimum lean angle. Should've clarified the 'minimum' bit : )
by james-o
27 Jun 2015, 1:24pm
Forum: Bikes & Bits – Technical section
Topic: Effect of bottom-bracket height
Replies: 17
Views: 2657

Re: Effect of bottom-bracket height

I think a higher bottom bracket and thus higher centre of gravity would make the bike feel more stable (the opposite of a car), much like a broom but not a pencil can be easily balanced on a finger. This is the idea behind the 14" plus BB on Geoff App's Cleland bikes. An amazingly agile bike a...
by james-o
21 May 2015, 6:55am
Forum: Touring & Expedition
Topic: Dirt road touring / bike-packing in Crete - info
Replies: 3
Views: 632

Re: Dirt road touring / bike-packing in Crete - info

Looks good .. I wondered what that area would be like for a trip a few year ago. Back on the list!
by james-o
21 May 2015, 6:49am
Forum: Bikes & Bits – Technical section
Topic: Recall Notices
Replies: 7
Views: 573

Re: Recall Notices

The Bicycle Association passes all recall notices to its members so the trade does get to hear of them. Perhaps a public-facing aspect of that would be good but to be fair they're simply passing info along, it's the manufacturer's responsibility for a reasonable means of contacting customers.
by james-o
8 May 2015, 10:52pm
Forum: The Tea Shop
Topic: Saddle soreness....a modern epidemic?
Replies: 41
Views: 3442

Re: Saddle soreness....a modern epidemic?

Interesting read .. re-directed from the expedition forum to this. I've stopped using lycra padded shorts gradually over the last year. Partly because I don't like the look of most current cycling clothing and wearing lycra shorts under looser-fitting shorts seems to be too warm and causes discomfor...
by james-o
12 Apr 2015, 10:00am
Forum: Bikes & Bits – Technical section
Topic: Genesis Croix de Fer - stiff enough in 60cm size?
Replies: 22
Views: 4057

Re: Genesis Croix de Fer - stiff enough in 60cm size?

Unless it's changed dramatically in recent years, it's a 31.8mm OD TT, 34.9mm OD DT, 8-5-8 and 9-6-9 tubes, the 725 version may use a grade thinner or shorter butts but there's little to no notable difference in overall stiffness when doing that (imo). So stiffness in the larger sizes is plenty, it ...
by james-o
21 Feb 2015, 5:30pm
Forum: Bikes & Bits – Technical section
Topic: Saddle height
Replies: 37
Views: 3067

Re: Saddle height

Interestingly with slightly longer cranks than normal for me (say 175 vs 170mm) I leave the saddle height the same above the BB; it appears that I don't pedal well on the longer cranks unless I ankle more. I've found similar too, I set my saddle based on height above BB and it's the same between bi...
by james-o
21 Feb 2015, 5:17pm
Forum: Bikes & Bits – Technical section
Topic: Future tech, could 12 spd solve the touring cassette problem
Replies: 70
Views: 4075

Re: Future tech, could 12 spd solve the touring cassette pro

12s.. no, thanks anyway .. 9 or 10 is plenty. I'm not convinced that I need the exact ratios and small steps more gears offer. Shimano seem obsessed by the idea that we need to maintain a cadence and shift accordingly. I'm happy at 50 rpm or 100 or so. Just slow down a tad and use the highest gear t...