Search found 184 matches

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: 854

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: 854

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: 854

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: 854

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...
by Chris Jeggo
9 Jun 2020, 3:09pm
Forum: Bikes & Bits – Technical section
Topic: Hallett's Howlers
Replies: 95
Views: 5771

Re: Hallett's Howlers

Hallett's chain length advice was certainly a howler.
by Chris Jeggo
20 May 2020, 2:32pm
Forum: Bikes & Bits – Technical section
Topic: Strange tyre ripples...
Replies: 23
Views: 916

Re: Strange tyre ripples...

Using a fingertip, see if you can move the tread rubber relative to the carcass.
by Chris Jeggo
20 May 2020, 12:57am
Forum: Bikes & Bits – Technical section
Topic: Strange tyre ripples...
Replies: 23
Views: 916

Re: Strange tyre ripples...

I once had a tyre where the tread started to delaminate from the carcass. As I recall, it produced effects a bit like yours, so I think that might be what is happening. I agree with Brucey that the photos show no evidence of structural problems in the carcass, so I would say keep on using it and kee...
by Chris Jeggo
20 May 2020, 12:28am
Forum: Bikes & Bits – Technical section
Topic: 6th Gear Virus
Replies: 32
Views: 1109

Re: 6th Gear Virus

Have you tried carefully examining the sprocket teeth and faces for wear marks that might give a clue to what is going on?
by Chris Jeggo
29 Apr 2020, 5:26pm
Forum: Bikes & Bits – Technical section
Topic: chain wear; another spot on the graph?
Replies: 32
Views: 2589

Re: chain wear; another spot on the graph?

Yes, dirt is the main enemy. In particular, you can't keep water out of a chain in rainy weather, and it matters not whether it is dirty water spray off the road, or cleanish water sprayed on to a dirty chain. You can try filling the interstices of a chain with grease, but it won't stay there, espec...
by Chris Jeggo
28 Apr 2020, 3:27pm
Forum: Bikes & Bits – Technical section
Topic: Front Derailleur positioning
Replies: 32
Views: 820

Re: Front Derailleur positioning

hondated wrote:Thanks pea. I have just fitted the FD at the recommended height and I am now getting this see photo
20200428_152123.jpg

Anyone e know why please

That looks like a change from middle to outer that never made it on to the outer teeth.
by Chris Jeggo
28 Apr 2020, 3:24pm
Forum: Bikes & Bits – Technical section
Topic: Front Derailleur positioning
Replies: 32
Views: 820

Re: Front Derailleur positioning

That looks like a Spa TD-2 chainset, for which a 113mm BB is recommended. 110mm is recommended for the similar XD-2.
When you get chain suck, what chainring change are you attempting? from? to?
by Chris Jeggo
27 Apr 2020, 12:43pm
Forum: Bikes & Bits – Technical section
Topic: Campag experts - parts identification please
Replies: 18
Views: 673

Re: Campag experts - parts identification please

De Sisti wrote:Have you sold any of the stuff yet?

The gear mechs have already gone. What is available can be seen at http://www.jeggo.org.uk/bike_parts/.
by Chris Jeggo
27 Apr 2020, 10:05am
Forum: Bikes & Bits – Technical section
Topic: Campag experts - parts identification please
Replies: 18
Views: 673

Re: Campag experts - parts identification please

Mark S wrote:There’s a Campag archive on retrobike ...

Thanks, Mark
by Chris Jeggo
27 Apr 2020, 12:08am
Forum: Bikes & Bits – Technical section
Topic: Campag experts - parts identification please
Replies: 18
Views: 673

Re: Campag experts - parts identification please

Brucey wrote:I'd assume by 1991 Chorus would have been available in 130mm. .....


Thanks, Brucey.
by Chris Jeggo
26 Apr 2020, 11:51pm
Forum: Bikes & Bits – Technical section
Topic: Campag experts - parts identification please
Replies: 18
Views: 673

Re: Campag experts - parts identification please

Thank you for today's posts. I concluded Centaur because my hubs are 130mm OLN, whereas Velobase has non-freehub Athena and Chorus hubs being 126mm OLN, but maybe Velobase doesn't know everything. Velobase has Victory (a few years old in 1991) being 126 or 130mm OLN, so that's possible but maybe not...