Search found 691 matches

by NetworkMan
13 Oct 2019, 8:32pm
Forum: Does anyone know … ?
Topic: Marathon Plus or Marathon Tour?
Replies: 28
Views: 921

Re: Marathon Plus or Marathon Tour?

It may or not matter but if the carcase is the same then I'd expect the 'tour' version to have significantly higher rolling resistance. Those individual tread blocks which help with grip on unmade roads and mud are each free to move around and that will absorb energy. It's the opposite extreme to a ...
by NetworkMan
13 Oct 2019, 2:53pm
Forum: Does anyone know … ?
Topic: changing a cassette - Shimano Sora
Replies: 23
Views: 826

Re: changing a cassette - Shimano Sora

if you start with the 13-26 (V group) cassette and the 11-34 (ca group) cassette you have two 13T sprockets which you might want to use as a top sprocket. Unfortunately I think neither will work. IIRC the 13, 14 pairing in the 13-26 nest together, i.e. the 13T is thicker than normal and part of the...
by NetworkMan
13 Oct 2019, 11:09am
Forum: Does anyone know … ?
Topic: Marathon Plus or Marathon Tour?
Replies: 28
Views: 921

Re: Marathon Plus or Marathon Tour?

On a related topic, I do have a few marathons but remain mind boggled by the variants. Can anyone point me at a simple guide to them all - with differences in easy to understand language? Yes, there are so many that recently I was almost put off buying any at all through indecision. In the end I we...
by NetworkMan
13 Oct 2019, 11:04am
Forum: Does anyone know … ?
Topic: Marathon Plus or Marathon Tour?
Replies: 28
Views: 921

Re: Marathon Plus or Marathon Tour?

https://www.google.com/aclk?sa=l&ai=DChcSEwjOia7945blAhXByN4KHTuyDb8YABAFGgJ3Yg&sig=AOD64_1DPstPvccHXzHXM1olUWP8FrLHlA&ctype=5&q=&ved=0ahUKEwjkrKf945blAhWLSRUIHaSFB4w4ChD1oAIIOw&adurl= Just bought a pair of GG in 700x 32 flavour for less than £36 incl p+p. :wink: https://yac...
by NetworkMan
12 Oct 2019, 3:19pm
Forum: Bikes & Bits – Technical section
Topic: New frame. Steep seat angle. Unrideable.
Replies: 81
Views: 4125

Re: New frame. Steep seat angle. Unrideable.

We still don't know how this resolved itself - do you feel like up dating us srb88? I think I may have missed this thread. If it's the builder I suspect they don't give any geometry on their website even though you can place on-line orders there. Perhaps the OP bought himself a Spa leather saddle. ...
by NetworkMan
12 Oct 2019, 2:14pm
Forum: Bikes & Bits – Technical section
Topic: Front derailleur capabilities - source?
Replies: 17
Views: 525

Re: Front derailleur capabilities - source?

Just to underline the point about advertised compatibility or lack of it. You can look at the Shimano "Compatability Chart" https://productinfo.shimano.com/#/com?cid=C-453&acid=C-455 .. If you look for 'drivetrain for road' -> 'front drivetrain compatibility' -> '3 x 9 speed' .... you'...
by NetworkMan
11 Oct 2019, 11:51am
Forum: Bikes & Bits – Technical section
Topic: Front derailleur capabilities - source?
Replies: 17
Views: 525

Re: Front derailleur capabilities - source?

As promised, some background to the points in my post upthread. Norman H has already addressed some of it. The 2 mm rule. Changing the size of a chainring by 1T changes the radius by 2 mm (actually more like 2.02 mm). This is useful, for example, when estimating how far you’ll need to move the FD wh...
by NetworkMan
10 Oct 2019, 4:20pm
Forum: Bikes & Bits – Technical section
Topic: Front derailleur capabilities - source?
Replies: 17
Views: 525

Re: Front derailleur capabilities - source?

Best is to find a copy of Cycle April/May 2003 and read the article "Beat the System". Short Summary; 1. Find the spec for your chainset from Shimano site. 50/39/30 for your (and my) Sora 9 speed. 2. Big ring: As spec +-4 teeth. So 46T to 54T. 3. Front difference: As spec. +0T -2T. So 9T t...
by NetworkMan
10 Oct 2019, 4:06pm
Forum: Bikes & Bits – Technical section
Topic: Single source for rim ERDs?
Replies: 14
Views: 494

Re: Single source for rim ERDs?

alexnharvey wrote:https://www.kstoerz.com/freespoke/rims

Thanks that's good. My rim is just too old though :(
by NetworkMan
10 Oct 2019, 3:24pm
Forum: Bikes & Bits – Technical section
Topic: Single source for rim ERDs?
Replies: 14
Views: 494

Re: Single source for rim ERDs?

Wish I did. I searched for one myself recently but the best I could find was last updated in 2004. Although it listed my Alesa Endeavour (as Rigida) the list is incomplete wiithout ERD. I think a re-rim might be a good first wheelbuilding project for me. http://www.fa-technik.adfc.de/Komponenten/Fel...
by NetworkMan
9 Oct 2019, 8:10pm
Forum: Bikes & Bits – Technical section
Topic: Gear changing strategy; how do you use a triple?
Replies: 61
Views: 1631

Re: Gear changing strategy; how do you use a triple?

Most of my bikes have 46/34/24 triple, I think there's one with 44/32/22, with 12 or 13 to 34 on the back. <snip> However, to-day I was out on a Spa prototype which was geared for a younger man, 48, 38, 28 and 11 to 32 on the back .....and I hardly got onto the big ring at all.<snip> but I want a c...
by NetworkMan
9 Oct 2019, 3:58pm
Forum: Bikes & Bits – Technical section
Topic: set back seat post ?
Replies: 37
Views: 1003

Re: set back seat post ?

I am also short of leg and long of torso and run a lot of setback, to counterbalance the cantilever of my upper body. Also tend to run longer stems or long reach bars as my short legs require 52-54cm frames but I prefer a 54-56cm top tube. sounds familiar already have a fairly long stem and flat ba...
by NetworkMan
9 Oct 2019, 11:44am
Forum: Bikes & Bits – Technical section
Topic: Which 9 speed triple for light tourer
Replies: 8
Views: 577

Re: Which 9 speed triple for light tourer

Another one for Brucey. Do you recall a discussion about relative durability of 24T-28T chainrings in steel vs. alloy? I thought that steel might be more durable but IIRC you said not necessarily. Spa have these rings in Spa Zicral at £11.50, Stronglight steel at £7.50, Stronglight Dural at £11.00 a...
by NetworkMan
9 Oct 2019, 11:25am
Forum: Bikes & Bits – Technical section
Topic: Gear changing strategy; how do you use a triple?
Replies: 61
Views: 1631

Re: Gear changing strategy; how do you use a triple?

Another acronym, the DNS or Deliberate Non Shift. Coming home with the shopping I'm on the middle ring and there is a short steep section just before I arrive. Although middle-to-big is inefficient and not all that low, it is low enough for this short hill and the bike arrives home on the middle rin...
by NetworkMan
8 Oct 2019, 6:29pm
Forum: Bikes & Bits – Technical section
Topic: Cassette question
Replies: 22
Views: 809

Re: Cassette question

8 and 9 speed chains are cheap and tedious to clean so I tend to change them at 0.5% elongation or less. Cogs and rings seem to last well. Rotating chains? Not for me - too much bother!