Search found 129 matches

by StephenW
13 Sep 2018, 10:33pm
Forum: Bikes & Bits – Technical section
Topic: Advantage of flexible forks
Replies: 11
Views: 880

Re: Advantage of flexible forks

I know that there are arguments over durability, but leaving that to one side for the moment, is there any consensus over whether steel or carbon forks are more comfortable? I mean, I'm sure there are very stiff and very comfortable forks in both materials, but among forks which you can actually buy...
by StephenW
13 Sep 2018, 10:14pm
Forum: Bikes & Bits – Technical section
Topic: Permanent battery lights
Replies: 9
Views: 543

Re: Permanent battery lights

I have this one: https://hollandbikeshop.com/en-gb/bicycle-lights/union-bicycle-lights/union-headlight-battery/union-headlight-classic/union-headlight-un-4915-retro-led-on-batteries-black/ It's OK. I did find that it was randomly getting flat batteries, but I realised that the problem was caused by ...
by StephenW
13 Sep 2018, 9:50pm
Forum: Bikes & Bits – Technical section
Topic: reasonable minimum maintenance - winter commuter
Replies: 23
Views: 1034

Re: reasonable minimum maintenance - winter commuter

How about fitting a chain case? Since I got one a couple of years ago, I have not needed to do anything to the chain. I use my bike almost every day.
by StephenW
10 Sep 2018, 9:19pm
Forum: Bikes & Bits – Technical section
Topic: Advantage of flexible forks
Replies: 11
Views: 880

Advantage of flexible forks

What is the main advantage of flexible (e.g. steel) forks? Is it: 1. To take the edge off bigger bumps? 2. To reduce vibration? Is it possible to come up with a rule of thumb for how fork stiffness and tyre size add up? E.g. a stiff fork with a 38 mm tyre feels similar to a flexible fork with a 28 m...
by StephenW
10 Sep 2018, 8:21pm
Forum: Bikes & Bits – Technical section
Topic: Chris Juden's talk at the 2017 York Rally
Replies: 88
Views: 4322

Re: Chris Juden's talk at the 2017 York Rally

If I search for "touren fahrrad" ... Unfortunately this is not good German. Different types of bike are mostly referred to as "___rad", e.g. Rennrad (racing bike), Hollandrad (Dutch bike), Liegerad (recumbent) etc. "Eine Radtour" simply means a bike ride. It does not n...
by StephenW
9 Sep 2018, 10:30pm
Forum: Non-standard, Human Powered Vehicles
Topic: Is it worth having a flexible steel fork on a recumbent?
Replies: 1
Views: 878

Re: Is it worth having a flexible steel fork on a recumbent?

I'm thinking about this fork: https://www.sjscycles.co.uk/forks/26-inch-thorn-raven-sport-tour-steel-fork-black-52-mm-offset-b-grade47433/ Does anyone know anything about these forks in general? Is it springy like a brick, or springy like a spaniel? Hopefully the backwards-mounted v-brakes will clea...
by StephenW
4 Sep 2018, 10:52pm
Forum: Campaigning & Public Policy
Topic: Electric car charging to kill off segregated cycle lanes
Replies: 66
Views: 2938

Re: Electric car charging to kill off segregated cycle lanes

I had not realised the Crossrail tunnels are as wide as that. OK, let's suppose that if they were dedicated to bikes, they could transport 28000 people per hour, per direction. The crossrail trains are designed to carry 1500 people each. If they go for 24 trains per hour (in each direction) that wou...
by StephenW
3 Sep 2018, 10:58pm
Forum: Campaigning & Public Policy
Topic: Electric car charging to kill off segregated cycle lanes
Replies: 66
Views: 2938

Re: Electric car charging to kill off segregated cycle lanes

Page 107 of this document shows the greenhouse gas emissions from cars due to journeys of different lengths. Journeys up to 5 miles are responsible for 19% of UK emissions from cars. Journeys from 5 to 10 miles are responsible for a further 18%. Realistically, a lot of people are not going to want t...
by StephenW
3 Sep 2018, 10:46pm
Forum: Campaigning & Public Policy
Topic: Electric car charging to kill off segregated cycle lanes
Replies: 66
Views: 2938

Re: Electric car charging to kill off segregated cycle lanes

When you think about cross rail, they could have used the East to West tunnel simply for bikes and it would have had a greater capacity by far than the trains and at a hugely lower cost. Is this correct? A figure of 14000 people per hour is sometimes quoted as being the number of people who can be ...
by StephenW
3 Sep 2018, 10:20pm
Forum: Non-standard, Human Powered Vehicles
Topic: Is it worth having a flexible steel fork on a recumbent?
Replies: 1
Views: 878

Is it worth having a flexible steel fork on a recumbent?

I have decided to try superman handlebars rather than tiller on my Metabike. The stem for the superman bars requires a much longer section of steerer to clamp onto, so it looks like I am going to need to get new forks. Is it worth having flexible steel forks on a recumbent? I feel that the bumps are...
by StephenW
26 Aug 2018, 3:30pm
Forum: Campaigning & Public Policy
Topic: Electric car charging to kill off segregated cycle lanes
Replies: 66
Views: 2938

Re: Electric car charging to kill off segregated cycle lanes

My understanding is that there are considerable doubts over whether using vehicle batteries to support the grid makes economic sense. Vehicle batteries only have a limited number of charge cycles, so if they are used to supply electricity to the grid then it shortens the batteries' life. It may be b...
by StephenW
26 Aug 2018, 2:56pm
Forum: Non-standard, Human Powered Vehicles
Topic: Getting into the recumbent cycling
Replies: 60
Views: 11453

Re: Getting into the recumbent cycling

Hello Quicksilver

Perhaps if you switch to clip-in pedals and cycling shoes, you will be able to comfortably spin a bit faster. If you know that your feet are securely attached to the pedals, you can relax more and focus on spinning.
by StephenW
23 Aug 2018, 6:59pm
Forum: Campaigning & Public Policy
Topic: Electric car charging to kill off segregated cycle lanes
Replies: 66
Views: 2938

Re: Electric car charging to kill off segregated cycle lanes

It seems to me that there are three questions being discussed here: 1. Are electric cars any good? 2. Are segregated cycle paths any good? 3. Will electric car charging points interfere with cycle paths? I think electric cars probably do have some role to play in the future, but I think they are als...
by StephenW
23 Aug 2018, 6:37pm
Forum: Non-standard, Human Powered Vehicles
Topic: Water-cooled Sturmey Archer drum brakes
Replies: 19
Views: 3677

Re: Water-cooled Sturmey Archer drum brakes

[XAP]Bob wrote:Water takes 4200J/degree/kg
Air takes 720J/degree/kg

Additionally water is significantly more dense, so you get more water around something, and has better thermal conductivity...


Don't forget the latent heat of vapourisation!

If the water boils, it absorbs 2260000J/kg!