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by Brucey
1 Feb 2012, 5:24pm
Forum: Bikes & Bits – Technical section
Topic: Replacing Headset Bearings
Replies: 69
Views: 5955

Re: Replacing Headset Bearings

the cage shouldn't touch the bearing surfaces or bear any load normally. Well, in theory.... So the balls you need are the same size as the old ones and more of them, enough to fill the races up, leaving a small (about one ball width) gap. 1/8" would be normal in a lot of headsets; you need to ...
by Brucey
1 Feb 2012, 4:00pm
Forum: Bikes & Bits – Technical section
Topic: Man's bike for a short girl?
Replies: 16
Views: 1244

Re: Man's bike for a short girl?

sounds like you are on track for a good result there... hope it works out!

cheers
by Brucey
31 Jan 2012, 11:12pm
Forum: Bikes & Bits – Technical section
Topic: Tyre sidewall repair?
Replies: 10
Views: 864

Re: Tyre sidewall repair?

if the tyre moves around much (rear tyre maybe) then you may find you get a puncture at the edge of the repair patch. I've 'repaired' tyres using patches cut from the sidewall of old tubular tyres and this has worked OK apart from this. Basically if it works you've got a little more life out of the ...
by Brucey
31 Jan 2012, 10:39pm
Forum: Bikes & Bits – Technical section
Topic: 8 Speed STIs with 9 Speed front mech
Replies: 3
Views: 208

Re: 8 Speed STIs with 9 Speed front mech

the only caveat is that the 9speed front mech is a little narrower so you may get a little chain rub where you wouldn't with a 7 or 8 speed mech. The throw is the same though.

cheers
by Brucey
31 Jan 2012, 10:30pm
Forum: Bikes & Bits – Technical section
Topic: What Makes Or Breaks A Touring Rim?
Replies: 32
Views: 3306

Re: What Makes Or Breaks A Touring Rim?

I wonder whether the black painted rims peform better with respect to this stress corrosion cracking? could be... 'cept maybe round the spoke holes.....the accepted wisdom is that 5000 series alloys are OK for SCC and some 6000 series are good enough , but both can go furry.... so not all furriness...
by Brucey
31 Jan 2012, 4:20pm
Forum: Bikes & Bits – Technical section
Topic: 111mm BB?
Replies: 67
Views: 2910

Re: 111mm BB?

Thanks for that, but if so, its using a JIS axle then, not an ISO which means it is using a shorter fatter spindle.... ....doesn't it...?

BTW how close does the axle come to 'bottoming' i.e. close to the end of the taper when you take the bolt off?

cheers
by Brucey
31 Jan 2012, 4:15pm
Forum: Bikes & Bits – Technical section
Topic: What Makes Or Breaks A Touring Rim?
Replies: 32
Views: 3306

Re: What Makes Or Breaks A Touring Rim?

I agree with this version of Brandt up to a point. However flange diameter, no. of spokes and hub torsional stiffness can all vary and this means that the torque-induced spoke force can vary x4 or more even for the same applied torque. Pedalling-induced wheel torsion loads rarely get very high until...
by Brucey
31 Jan 2012, 1:21pm
Forum: Bikes & Bits – Technical section
Topic: 111mm BB?
Replies: 67
Views: 2910

Re: 111mm BB?

my recollection -which could be faulty so bear with me- is that one or other (or possibly both) the 60s-70's 'stronglight 49D' and 'TA cyclotouriste' cranksets used a shorter fatter taper that was later discontinued. Both these cranksets also used a different crank extractor thread, too. When the re...
by Brucey
31 Jan 2012, 1:00pm
Forum: Bikes & Bits – Technical section
Topic: Replacing Headset Bearings
Replies: 69
Views: 5955

Re: Replacing Headset Bearings

Still OT but I've been thinking about the 'noisy record/chorus freehub' issue and come to think of it the first record 10 freehub I rode was pretty quiet, which I took to be some combination of design changes and lubrication. I now realise that this one was likely bone dry, but I later assumed that ...
by Brucey
31 Jan 2012, 11:59am
Forum: Bikes & Bits – Technical section
Topic: 111mm BB?
Replies: 67
Views: 2910

Re: 111mm BB?

I think a lot of the problems occur when the original BB wears out and an identical replacement is difficult or impossible to source. The generally held (and IMHO, misleading) view that 'barring ISO and JIS the tapers are all very similar' is OK -within limits- when fitting new cranks and BBs togeth...
by Brucey
31 Jan 2012, 11:29am
Forum: Bikes & Bits – Technical section
Topic: What Makes Or Breaks A Touring Rim?
Replies: 32
Views: 3306

Re: What Makes Or Breaks A Touring Rim?

I did a 'back of envelope' calculation re. this some time ago in relation to spoke fatigue loadings in disc wheels. They are increased for sure, but even with some dreadful assumptions re. the amount of time spent braking, I couldn't get the fatigue loads up more than about 10% over 'normal'. This i...
by Brucey
31 Jan 2012, 10:27am
Forum: Bikes & Bits – Technical section
Topic: What Makes Or Breaks A Touring Rim?
Replies: 32
Views: 3306

Re: What Makes Or Breaks A Touring Rim?

Re rim failures; a little more to add to this topic.... 'Wearing out' can be pretty much stopped by hard coatings on the rim surface. Mavic used sprayed coatings a few years back which worked OK but flaked off if you dinged a rim even slightly. Ordinary Anodising wears through rather quickly. Now, t...
by Brucey
31 Jan 2012, 8:31am
Forum: Bikes & Bits – Technical section
Topic: Replacing Headset Bearings
Replies: 69
Views: 5955

Re: Replacing Headset Bearings

if it then stayed quiet for hundreds of miles with just a few drops of oil in, then yes it must be different. Either that or we have different ideas about what is quiet and noisy...

cheers
by Brucey
30 Jan 2012, 11:25pm
Forum: Bikes & Bits – Technical section
Topic: Improving Triple Shifting.
Replies: 158
Views: 5096

Re: Improving Triple Shifting.

I see Campag were using caged bearings in '74. When did caged bearings first become popular*, I wonder? *Or should I just say 'commonplace'? used in SA hubs for years and years and years..... BTW in SA and Campy hubs caged bearings only rob you of one (or sometimes not even one) ball. In this respe...
by Brucey
30 Jan 2012, 11:04pm
Forum: Bikes & Bits – Technical section
Topic: Replacing Headset Bearings
Replies: 69
Views: 5955

Re: Replacing Headset Bearings

different? -quite possibly re the ones I've 'used to death' but if so, all the record and chorus ones I've ridden shorter distances have had no grease in then; even if they are quieter than others, they were quite noisy by comparison with what I'm used to. I think if you get the lube right, almost a...