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by Brucey
22 Mar 2019, 7:21am
Forum: Bikes & Bits – Technical section
Topic: Saddle moving
Replies: 10
Views: 341

Re: Saddle moving

Mrs rjb has a single bolt hockey style seat pin on the tandem. This has no serrations and occasionally tilts rearwards. No amount of tightening seems to cure it. I roughened the surfaces with some emery which has sorted it at the moment but if it reoccurs I may resort to filing some serrated teeth ...
by Brucey
22 Mar 2019, 6:59am
Forum: Bikes & Bits – Technical section
Topic: Removing stuck chainring bolts
Replies: 12
Views: 305

Re: Removing stuck chainring bolts

Hmm - there must be some mod I can do to an old G-Clamp to make one of those? I have been thinking the same thing. The piece on the VAR tool which engages with the sleeve is the important part, and it is tiny .... BTW i meant to mention; as it happens the photo of the simple tool shows a bolt assem...
by Brucey
21 Mar 2019, 10:00pm
Forum: Bikes & Bits – Technical section
Topic: Can I lace wheel rim ignoring the spoke hole offset?
Replies: 11
Views: 416

Re: Can I lace wheel rim ignoring the spoke hole offset?

re cracking in Rohloff flanges. There are various reasons for this, including 1) the hubshell is machined from bar stock (rather than being forged) 2) the material is not immune from the effects of corrosion 3) the spoke tensions are set too high 4) the hub has been relaced in a different pattern. 5...
by Brucey
21 Mar 2019, 7:56pm
Forum: Bikes & Bits – Technical section
Topic: Driveside Hollowtech11 chainset spacer/washer/seal?
Replies: 12
Views: 455

Re: Driveside Hollowtech11 chainset spacer/washer/seal?

jamesofyorkshire wrote:105, 5800 11-sp. I am not with the bike at the moment so cannot quote part numbers.....


the correct part number is given upthread; I don't see what the problem is, exactly...?

cheers
by Brucey
21 Mar 2019, 7:27pm
Forum: Bikes & Bits – Technical section
Topic: Removing stuck chainring bolts
Replies: 12
Views: 305

Re: Removing stuck chainring bolts

FWIW if you are a tool fetishist or a professional mechanic then you might like to get one of these http://ecx.images-amazon.com/images/I/41uXVJv0imL.jpg https://www.vartools.com/images/photos/produits/828_1042_712_XL.PNG VAR or https://www.bike24.com/i/p/6/4/73246_00_d.jpg cyclus. Compared with the...
by Brucey
21 Mar 2019, 6:07pm
Forum: Does anyone know … ?
Topic: freehub question
Replies: 1
Views: 178

Re: freehub question

the freehub body (for a shimano hub) either comes as a bare body (with the bearings in), or 'complete' i.e. with the bolt and the dustcap fitted. You need to know exactly which hub you have; there are about a hundred different parts numbers for shimano freehub bodies and about the same number again ...
by Brucey
21 Mar 2019, 6:00pm
Forum: Bikes & Bits – Technical section
Topic: chain wear; another spot on the graph?
Replies: 8
Views: 481

Re: chain wear; another spot on the graph?

re cleanliness; I have many times noted that chains that are regularly cleaned will often last about double the mileage of ones that are not; in extremis I have (on MTBs) cleaned chains every day . But I've only occasionally seen a chain that has only been used when clean, and normally they have sti...
by Brucey
21 Mar 2019, 5:41pm
Forum: Bikes & Bits – Technical section
Topic: Removing stuck chainring bolts
Replies: 12
Views: 305

Re: Removing stuck chainring bolts

if they spin then it is a question of a) breaking the bonds of corrosion and b) turning the bolts. If you can get a bolster behind the bolt a few smart taps with a hammer may help to break the binds of corrosion. Using a 1/4" drive 5mm bit will allow you to apply the hammer blow where it will d...
by Brucey
21 Mar 2019, 5:28pm
Forum: Bikes & Bits – Technical section
Topic: Can I lace wheel rim ignoring the spoke hole offset?
Replies: 11
Views: 416

Re: Can I lace wheel rim ignoring the spoke hole offset?

one option is to lace the rim with the correct stagger, but with the valve hole in the 'wrong place' in the spoke pattern. cheers Just out of interest - Would drilling another valve hole cause any problems? not especially. The rim is a touch weakened where the hole is, but this only really matters ...
by Brucey
21 Mar 2019, 5:23pm
Forum: Bikes & Bits – Technical section
Topic: Carrera subway headset bearing kit.
Replies: 2
Views: 148

Re: Carrera subway headset bearing kit.

Carrera Subway MTBs are halfords own brand and have been made for about 20 years now; they have used a variety of headsets in that time. The steerer will most likely be 1-1/8" diameter (28.575mm) which is often referred to as 28.6mm. There are very many possibilities for the other dimensions of...
by Brucey
21 Mar 2019, 11:30am
Forum: Bikes & Bits – Technical section
Topic: Saddle moving
Replies: 10
Views: 341

Re: Saddle moving

You don't say what seat pin you have but this talk of a single bolt suggests that it is a single bolt seat pin (with serrations?). Possibly the clamp parts are hitting one another before the saddle rails are being clamped properly. You may be able to overcome this by relieving the clamp parts or by ...
by Brucey
21 Mar 2019, 10:20am
Forum: Bikes & Bits – Technical section
Topic: Rear mech compatible ? Impossible to adjust right
Replies: 15
Views: 480

Re: Rear mech compatible ? Impossible to adjust right

if the old gear cable has worn a slot in the BB guide, a new cable will bind in that slot if it is even fractionally wider. Often widening the groove slightly will allow free-running again. FWIW I would suggest that you try the new shifters with the RD-M771 mech as well. If you have a set of Vernier...
by Brucey
21 Mar 2019, 12:01am
Forum: Bikes & Bits – Technical section
Topic: Rear mech compatible ? Impossible to adjust right
Replies: 15
Views: 480

Re: Rear mech compatible ? Impossible to adjust right

well the other usual suspects are 1) draggy cables 2) cable set wrongly in the RD pinch bolt (so the shift ratio is wrong) 3) gear hanger out of alignment 4) something odd happening with the cassette so it might be worth taking another look at those things? BTW 4700 shifters will only work with RD-4...
by Brucey
20 Mar 2019, 11:48pm
Forum: Bikes & Bits – Technical section
Topic: Rear mech compatible ? Impossible to adjust right
Replies: 15
Views: 480

Re: Rear mech compatible ? Impossible to adjust right

no such thing as 'SL-780'....?

There are

SL-R780 (road) shifters

or

SL-M780 (MTB) shifters

the latter won't work with road mechs.

Could that be the problem?

cheers
by Brucey
20 Mar 2019, 10:19pm
Forum: Bikes & Bits – Technical section
Topic: Can I lace wheel rim ignoring the spoke hole offset?
Replies: 11
Views: 416

Re: Can I lace wheel rim ignoring the spoke hole offset?

one option is to lace the rim with the correct stagger, but with the valve hole in the 'wrong place' in the spoke pattern. Another is to relace one hub flange, thus giving a good valve position. A further option is to lace the rim 'wrongly' but to have 'tweaked' the rim first; either chasing the hol...