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by 531colin
22 Oct 2017, 8:14pm
Forum: Bikes & Bits – Technical section
Topic: Pedalling efficiency on rocky tracks
Replies: 14
Views: 276

Re: Pedalling efficiency on rocky tracks

..........I think... the more "solid" your connection points (handlebars, pedals, saddle), and your connection with the ground (tyres), and the more comfortable and ergonomic your position, the more "at one" with the bike you will feel............ Hmmmm, I'm not sure I agree com...
by 531colin
15 Oct 2017, 8:01pm
Forum: Bikes & Bits – Technical section
Topic: Fixed gear audax bike (steel or Ti)
Replies: 7
Views: 681

Re: Fixed gear audax bike (steel or Ti)

Titanium is about a third less dense than steel, but also about a third less stiff, gram for gram. So for frames that are comparable in design philosophy and intended purpose, the overall difference between the 2 materials is liable to be slight. The stiffness of a tube is most greatly influenced by...
by 531colin
15 Oct 2017, 6:46pm
Forum: Bikes & Bits – Technical section
Topic: Reynolds '531 C' for use on small touring frame?
Replies: 19
Views: 634

Re: Reynolds '531 C' for use on small touring frame?

If the frame is ready to go, bung it together and try it. I suspect it will be fine.....as people keep saying, many heavier people have ridden and raced on bigger 531c frames. I have ridden alongside more than one Bob Jackson 531c tourer, although I don't know details of stays or esoteric stuff like...
by 531colin
4 Oct 2017, 6:48pm
Forum: Women's cycling interests
Topic: A decent saddle.
Replies: 17
Views: 12228

Re: A decent saddle.

Colin, that guide is wonderful, so thorough and sensible, thank you so much. :D It's basically all the good advice I wasted days digging out from all over the place in one document, plus a lot of other really useful stuff I didn't know about and which wasn't mentioned anywhere I looked. I was espec...
by 531colin
4 Oct 2017, 6:34pm
Forum: Bikes & Bits – Technical section
Topic: front wheel flexes whilst climbing? cause
Replies: 30
Views: 1257

Re: front wheel flexes whilst climbing? cause

martinn wrote:Hi all,

I have a SP dynamo hub with a 32 hole H-plus son rim (Handbuilt wheel from a reputable supplier). I weigh about 80Kg. The forks are carbon

When I climb,and get out of the saddle and put some effort in, ............
by 531colin
4 Oct 2017, 6:32pm
Forum: Bikes & Bits – Technical section
Topic: front wheel flexes whilst climbing? cause
Replies: 30
Views: 1257

Re: front wheel flexes whilst climbing? cause

........... BTW I've had to partially rethink my idea of fatigue in spokes; on the one hand it might usually be worse in the spokes which have higher tension in them. On the other hand the spokes that see the largest tension variations can have the worst fatigue damage and spokes that go completely...
by 531colin
4 Oct 2017, 6:13pm
Forum: Bikes & Bits – Technical section
Topic: front wheel flexes whilst climbing? cause
Replies: 30
Views: 1257

Re: front wheel flexes whilst climbing? cause

JakobW wrote:With higher spoke tensions a given external load makes for a proportionally smaller deflection, no? At least that's what I get when I try and visualise the vector triangles.

No. Elongation is linearly proportional to load increase.....Hooke's Law/Young's Modulus/whatever.
by 531colin
4 Oct 2017, 6:10pm
Forum: Bikes & Bits – Technical section
Topic: front wheel flexes whilst climbing? cause
Replies: 30
Views: 1257

Re: front wheel flexes whilst climbing? cause

what is the spoke pattern on this wheel? Spoke pattern is i think is this https://www.sheldonbrown.com/wheelbuild.html the muliti coloured pattern about halfway down All you need to do is to count how many other spokes every spoke crosses, including the cross that's right next to the hub flange. (I...
by 531colin
4 Oct 2017, 6:05pm
Forum: Does anyone know … ?
Topic: Anyone with a gravel/adventure bike ?
Replies: 75
Views: 3335

Re: Anyone with a gravel/adventure bike ?

Might steer a bit strange with a handlebar bag.
by 531colin
4 Oct 2017, 2:29pm
Forum: Bikes & Bits – Technical section
Topic: Calibrating Park Tool TM-1 spoke tension meter
Replies: 57
Views: 7893

Re: Calibrating Park Tool TM-1 spoke tension meter

What is the point of looking at tensions of 30 or 150kgf when the range you are going to use is probably only 80 to 120....?

It looks to me that (provided the thing is correctly calibrated at the start) that gauge is perfectly OK for real world tensions and real world accuracy.
by 531colin
4 Oct 2017, 2:22pm
Forum: Does anyone know … ?
Topic: Anyone with a gravel/adventure bike ?
Replies: 75
Views: 3335

Re: Anyone with a gravel/adventure bike ?

https://forum.cyclinguk.org/download/file.php?id=48356&mode=view Pete's bikes........... Now just suppose that Pete wanted to put flat bars on those bikes...... I like the grips on flat bars at about the same reach as where the brake hoods attach to the (drop) bars......if Pete wanted to do tha...
by 531colin
3 Oct 2017, 6:33pm
Forum: Bikes & Bits – Technical section
Topic: Gearing : resolving the 17t - 20t sprocket jump
Replies: 29
Views: 1351

Re: Gearing Yes yet again.

I am once again wondering whether the gearing I am using is correct for me 44-32-22 x 9 speed 11 -34 as I seem to spin to much. So last night I searched the forum and found the thread I think started by Colin who mentions the jump from 17t to 20 not being ideal so I checked my bikes out today and i...
by 531colin
3 Oct 2017, 6:26pm
Forum: Bikes & Bits – Technical section
Topic: Calibrating Park Tool TM-1 spoke tension meter
Replies: 57
Views: 7893

Re: Calibrating Park Tool TM-1 spoke tension meter

chart in a post above. '28' is allegedly 173kgf,................ I can't read that on my phone. Its 10 years since I retired from Spa, but I think they now check (all) their Park gauges against something much more expensive. In my time there we sent back a whole batch of Park gauges which read way ...
by 531colin
2 Oct 2017, 9:08pm
Forum: Bikes & Bits – Technical section
Topic: Calibrating Park Tool TM-1 spoke tension meter
Replies: 57
Views: 7893

Re: Calibrating Park Tool TM-1 spoke tension meter

Hi, Firstly, thank you to SimonCelsa for starting the thread. Handy to find. My original wheels were built up by Spa Cycles some 7 years ago. These were Rigida Sputniks 26" alloy 36H. Using Sapim Race front and NDS. Sapim Strong on the rear DS. They have served me well on self-supported laden ...

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