Search found 33473 matches

by Brucey
20 May 2019, 10:42pm
Forum: Bikes & Bits – Technical section
Topic: How much longer do drum brakes go
Replies: 9
Views: 500

Re: How much longer do drum brakes go

I've seen the insides of lots of coaster brake hubs, on a, uh, 'non-voluntary' basis.... Almost certainly more than I should have done, given the proportion of bikes that are fitted with them. Oddly enough prior to the mid 1930s, I am given to understand that the sturmey coaster brake 3s hub was a f...
by Brucey
20 May 2019, 2:47pm
Forum: Bikes & Bits – Technical section
Topic: Help. Frame broken.
Replies: 16
Views: 963

Re: Help. Frame broken.

that'll work!

cheers
by Brucey
20 May 2019, 11:12am
Forum: Bikes & Bits – Technical section
Topic: Running 135mm hubs in a 130 frame
Replies: 2
Views: 203

Re: Running 135mm hubs in a 130 frame

it might; I'd respace the hubs a bit narrower and redish as necessary. It is not that difficult to do, and if you take out 3mm that ought to be enough.

cheers
by Brucey
20 May 2019, 10:23am
Forum: Does anyone know … ?
Topic: Shimano road bike - info sought before sale
Replies: 31
Views: 1670

Re: Shimano road bike - info sought before sale

re the possible (probable) frame distortion; this is difficult to certain of because of possible lens distortion etc. However you can compare the clearance between the front wheel rim (not the tyre which can vary in size) and the down tube; in the photo I posted (assuming the frame is the same of co...
by Brucey
20 May 2019, 10:05am
Forum: Bikes & Bits – Technical section
Topic: How much longer do drum brakes go
Replies: 9
Views: 500

Re: How much longer do drum brakes go

Coaster hub brakes are the way to go for (almost) zero maintenance. I'm a trendy consumer. Just look at my gormless idiot phone. coaster brakes (hub brakes that are actuated by back-pedalling) are very simple brakes (in singlespeed form) that are used in their millions on all kinds of basic roadste...
by Brucey
19 May 2019, 10:13pm
Forum: Bikes & Bits – Technical section
Topic: How much longer do drum brakes go
Replies: 9
Views: 500

Re: How much longer do drum brakes go

with SA drums, that is pretty much it. Just an occasional adjustment of the barrel adjuster is required. Balanced against that, getting the rear wheel in and out takes a bit longer.

cheers
by Brucey
19 May 2019, 8:18pm
Forum: Bikes & Bits – Technical section
Topic: Simple wheel building question - new rim, old spokes
Replies: 9
Views: 454

Re: Simple wheel building question - new rim, old spokes

you can't just flip the rim and solve it. If the rim handedness is different in the new rim your choices are a) having the valve in the wrong place b) drilling another valve hole in the rim c) Ignoring the stagger in the rim drilling d) relacing one side of the wheel so that the spokes are in differ...
by Brucey
19 May 2019, 7:26pm
Forum: Bikes & Bits – Technical section
Topic: pulley wear; is this a record?
Replies: 17
Views: 883

Re: pulley wear; is this a record?

IIRC the SR (first version) mech would originally have had plastic 10T pulleys (with bronze bushings). https://i.pinimg.com/originals/75/0c/60/750c60ebda79d7b804b214280391bfcb.jpg The teeth are not that tall but there would be some purchase on a modern chain rather than none. Swings and roundabouts ...
by Brucey
19 May 2019, 6:11pm
Forum: Bikes & Bits – Technical section
Topic: Simple wheel building question - new rim, old spokes
Replies: 9
Views: 454

Re: Simple wheel building question - new rim, old spokes

CXP22 rim ERD is about 599mm +/- a bit depending on exact model and tolerances.

You can go a bit larger or a bit smaller depending on how the spokes sit in the nipples at present.

cheers
by Brucey
19 May 2019, 5:17pm
Forum: Bikes & Bits – Technical section
Topic: down tube diameters for band-on shifters
Replies: 4
Views: 230

Re: down tube diameters for band-on shifters

yep standard DT bands are 28.6mm (1-1/8") size. Some levers are made to fit onto quill stems etc and have 22.2mm bands; these levers also have stops for cable housing built in, so can easily be relocated, whereas only some 28.6mm band levers have the same cable stops. If you have some basic wor...
by Brucey
19 May 2019, 4:10pm
Forum: Bikes & Bits – Technical section
Topic: Front mech of a different kind
Replies: 9
Views: 585

Re: Front mech of a different kind

FWIW genesis use mechs like FD-M618 (high band version I think) on vagabonds with 2x transmissions.

cheers
by Brucey
19 May 2019, 12:58pm
Forum: Bikes & Bits – Technical section
Topic: Avid BB7 broken disc caliper
Replies: 6
Views: 267

Re: Avid BB7 broken disc caliper

further to my earlier comment it looks as if there is a slight difference in the facture appearance near the bolt. Also it looks like there is a sharp raised edge where the 'disc groove radius' meets the 'pad pocket', very close to the bolt hole. It strikes me that the raised edge would be an ideal ...
by Brucey
19 May 2019, 8:25am
Forum: Bikes & Bits – Technical section
Topic: Titanium seatpost that is all titanium
Replies: 27
Views: 805

Re: Titanium seatpost that is all titanium

one of the options for a road bike with ~5" showing is a campag record/chorus model from the late 1990s. Ti post with aluminium clamp. I have one of these in my road bike; in the throes of a titanium frenzy, I bought it used about fifteen years ago, and I thought it was expensive then, even tho...
by Brucey
19 May 2019, 7:43am
Forum: Bikes & Bits – Technical section
Topic: Avid BB7 broken disc caliper
Replies: 6
Views: 267

Re: Avid BB7 broken disc caliper

a thought struck me; the threads for lower bolt have almost broken through the casting, so the fracture face is only about 1mm wide just next to the threads. That might have been stress concentration enough to provoke a brittle fracture. [edit; I wonder how much variation there is in this dimension....
by Brucey
19 May 2019, 12:15am
Forum: Bikes & Bits – Technical section
Topic: Titanium seatpost that is all titanium
Replies: 27
Views: 805

Re: Titanium seatpost that is all titanium

5" of seat pin showing isn't a lot. IME most aluminium clamp parts last longer than the saddle rails that are attached to them. You could look at the seat pin as being a consumable part; one which doesn't last forever but doesn't cost a fortune either. One that can easily be removed, inspected ...