Search found 180 matches

by Chris Jeggo
29 Sep 2020, 12:29am
Forum: Bikes & Bits – Technical section
Topic: chainring question.
Replies: 6
Views: 354

Re: chainring question.

Quite right. 1/2 inch difference in circumference => 12.7mm/2pi = 2.02mm difference in radius.
by Chris Jeggo
18 Sep 2020, 9:13am
Forum: Bikes & Bits – Technical section
Topic: New tyres
Replies: 6
Views: 314

Re: New tyres

ElCani wrote:Are you sure about that tyre size? 594 is not a "26 inch" size I recognise, ....

I wondered that, too. SJS cycles list 590 and 597, two widely used sizes in that era.

See also the Cycling UK guide (based on CJ's much earlier CTC web-page) - 590 and 597, but no 594.
by Chris Jeggo
8 Sep 2020, 12:57am
Forum: Bikes & Bits – Technical section
Topic: Seat pin slippage
Replies: 30
Views: 950

Re: Seat pin slippage

I believe that it's conventional at this point to refer to The Zen Shim Question: http://www.hilarygallo.com/the-zen-shim-question/ Thank you for relieving me of the need ever to find out what that book is all about :roll: I found 'that book' fascinating, one of the few I have read three times. It ...
by Chris Jeggo
27 Aug 2020, 10:37am
Forum: Bikes & Bits – Technical section
Topic: Change chain set
Replies: 3
Views: 158

Re: Change chain set

I recently bought a 40/33/24 square taper chainset from Spa Cycles. (It could have been 42/33/24.) 33t and 24t are the smallest sprockets that can be fitted to a 110mm and 74mm BCD spider, which is a standard size. Another bike of mine has 42/32/22, but that is Shimano Deore and not square taper.
by Chris Jeggo
15 Aug 2020, 2:18am
Forum: Bikes & Bits – Technical section
Topic: Hewitt Chiltern, Cheviot, et al
Replies: 59
Views: 2384

Re: Hewitt Chiltern, Cheviot, et al

... Would be interested to see if anyone spots the frames being sold elsewhere under whatever brand. Isn't it very likely that they still are? For of course Pearsons/Hewitts or Byercycles didn't make them - they were churned out somewhere out east - though very nicely. I would be interested in buyi...
by Chris Jeggo
13 Aug 2020, 9:51am
Forum: Bikes & Bits – Technical section
Topic: Hewitt Chiltern, Cheviot, et al
Replies: 59
Views: 2384

Re: Hewitt Chiltern, Cheviot, et al

There's a Cycle review from 2015, an SE but apparently the only difference was the tubeset. https://www.cyclinguk.org/sites/default/files/document/migrated/publication/201511072.pdf it doesn't have the same detail as the one CJ did a decade before. ... I have scanned CJ's review: http://www.jeggo.o...
by Chris Jeggo
15 Jun 2020, 3:31pm
Forum: Bikes & Bits – Technical section
Topic: Double brake lever , cable pull
Replies: 15
Views: 389

Re: Double brake lever , cable pull

It just happens that I was answering a question on our FB page and put up a picture of a Cyclon trike. I notice that it has 3 brakes, 2 on one lever and the third on a handlebar control gear lever. Pretty much as suggested above although your configuration would be different. cyclon-trike.jpg Does ...
by Chris Jeggo
14 Jun 2020, 5:43pm
Forum: Bikes & Bits – Technical section
Topic: Expert advice on choice of front derailleur, please.
Replies: 23
Views: 835

Re: Expert advice on choice of front derailleur, please.

Many thanks, nsew and gaz,

for your further useful suggestions.

As soon as I have a good solution, I'll post here to let you all know what it is.

Chris
by Chris Jeggo
11 Jun 2020, 2:07pm
Forum: Bikes & Bits – Technical section
Topic: Expert advice on choice of front derailleur, please.
Replies: 23
Views: 835

Re: Expert advice on choice of front derailleur, please.

I just looked on ebay and the going rate for 'deer head' FD-M700 appears to be about £35 (*cough*....) used or about double that NOS. There are other (less expensive) shimano FDs which might do though... cheers Thanks, Brucey, for that really useful suggestion. £35 does seem OTT, but if it's the on...
by Chris Jeggo
11 Jun 2020, 1:56pm
Forum: Bikes & Bits – Technical section
Topic: Spa Wayfarer with 27.5" wheels
Replies: 35
Views: 1281

Re: Spa Wayfarer with 27.5" wheels

Have you considered a sprung saddle instead of a suspension seat post? I have fitted a Brooks Flyer to my off-road bike, a hard-tail with suspension forks, and am happy with it.

Chris
by Chris Jeggo
11 Jun 2020, 11:28am
Forum: Bikes & Bits – Technical section
Topic: Expert advice on choice of front derailleur, please.
Replies: 23
Views: 835

Re: Expert advice on choice of front derailleur, please.

Just picking up on your comment about the BB length: ... I’m curious about your gearing choices, can you share a bit more about that? Sounds interesting. Peter H Yes, the chainline is tight. With my 113mm axle it is 44-45mm but there seems to be enough clearance so I will stick with that. Re gearin...
by Chris Jeggo
11 Jun 2020, 10:06am
Forum: Bikes & Bits – Technical section
Topic: Expert advice on choice of front derailleur, please.
Replies: 23
Views: 835

Re: Expert advice on choice of front derailleur, please.

slowster wrote:SJS occasionally have some New Old Stock MTB front derailleurs. Currently they have this one, which might be worth trying given the low price.

Thanks for that. It's cheap enough and easy enough to do the experiment, so I shall.
by Chris Jeggo
10 Jun 2020, 12:12pm
Forum: Bikes & Bits – Technical section
Topic: Expert advice on choice of front derailleur, please.
Replies: 23
Views: 835

Re: Expert advice on choice of front derailleur, please.

Gentlemen, thank you for your replies so far. A further thought: 20 years ago I used a half-step-and-granny set-up. I haven't kept that front mech, nor a precise record of what model it was, but IIRC it was a double, not a triple. So might a double work better than a triple for the set-up I currentl...
by Chris Jeggo
9 Jun 2020, 6:15pm
Forum: Bikes & Bits – Technical section
Topic: Expert advice on choice of front derailleur, please.
Replies: 23
Views: 835

Expert advice on choice of front derailleur, please.

I am building a touring bike with a 3x9 transmission. Hubs are Shimano 105 and chainset is Spa TD-2 on its recommended 113mm BB so chainline is 45mm. Downtube is 28.6mm. Chainrings are 40-33-24t to get the gear ratios I want. MTB FDs are designed for smaller chainrings than road FDs, but I think the...