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by Brucey
5 Feb 2012, 3:23pm
Forum: Bikes & Bits – Technical section
Topic: Dumb chain question
Replies: 57
Views: 2000

Re: Dumb chain question

Am I really the only one who has a working set of vernier calipers and is prepared to use them? No. They are steel Biopace SG and my calipers show 2.15mm. thanks; if so, that makes them the widest chainrings yet, certainly the widest to run a 9 speed chain on happily. I've just measured some of my ...
by Brucey
5 Feb 2012, 12:09pm
Forum: Bikes & Bits – Technical section
Topic: Dura ace bar end shifters
Replies: 13
Views: 796

Re: Dura ace bar end shifters

shibster, what parts are you trying to make work together?

if you are baking a cake you might be doing it wrong but if you have a mismatched set of ingredients it doesn't matter how well you do it, it'll taste terrible...

cheers
by Brucey
5 Feb 2012, 12:06pm
Forum: Bikes & Bits – Technical section
Topic: Dumb chain question
Replies: 57
Views: 2000

Re: Dumb chain question

but how wide are your chainrings ? If they are the first biopace mark 1 aluminium then they were sold with 6 speed but later biopace mark 1 and biopace II ('biopace SG' IIRC) were 7/8 speed compatible, even though they were also routinely fitted on bikes that were 6-speed equipped. Biopace steel ri...
by Brucey
5 Feb 2012, 10:03am
Forum: Bikes & Bits – Technical section
Topic: 21" Frame what wheels
Replies: 7
Views: 374

Re: 21" Frame what wheels

need to know the distance from the brake mountings to the dropout centres.

Frame size says nothing about wheel size to go into frame; lots of different wheel sizes....

cheers
by Brucey
5 Feb 2012, 10:00am
Forum: Bikes & Bits – Technical section
Topic: Dura ace bar end shifters
Replies: 13
Views: 796

Re: Dura ace bar end shifters

chaps, until the OP says what bits he has, are we not merely speculating as to which of the many hundreds of possible problems he might have?

cheers
by Brucey
5 Feb 2012, 9:56am
Forum: Bikes & Bits – Technical section
Topic: Dumb chain question
Replies: 57
Views: 2000

Re: Dumb chain question

normally they are paralell-sided where the chain inner side plates slip over, but are as you say tapered above that near the very tip of the tooth. However some recent shimano ones (and maybe others for all I know) are made with a taper that extends the full height of the tooth. In fact they look 'w...
by Brucey
5 Feb 2012, 9:41am
Forum: Bikes & Bits – Technical section
Topic: Spray-on snow chain tyre grip stuff
Replies: 10
Views: 1365

Re: Spray-on snow chain tyre grip stuff

studs and snow chains might get you, I dunno, to maybe 25 or 50% of 'normal' grip levels. 'up to 300%' means they got a x3 improvement, once maybe, during their tests. Sounds impressive, huh... Well if you started with 1% of normal grip and did the best you could and got to the giddy heights of 3% i...
by Brucey
5 Feb 2012, 9:04am
Forum: Bikes & Bits – Technical section
Topic: Spray-on snow chain tyre grip stuff
Replies: 10
Views: 1365

Re: Spray-on snow chain tyre grip stuff

its a bit like the 'does having treaded tyres make much difference on slippy white lines' discussion; well it might make for half as much grip again but it is still next to nothing..... BTW I've sen people make things fitted over their wellies out of chicken wire; I wonder if you could make snow cha...
by Brucey
5 Feb 2012, 8:54am
Forum: Bikes & Bits – Technical section
Topic: Dura ace bar end shifters
Replies: 13
Views: 796

Re: Dura ace bar end shifters

many different flavours of dura-ace bar end levers, XT mechs and # of index positions. Need to know which model of each, how many gears you are going for etc.

Only common theme is that most XT mechs have the same throw (apart I think from 10-speed ones....)

cheers
by Brucey
4 Feb 2012, 10:02pm
Forum: Bikes & Bits – Technical section
Topic: Economy non-knobblies
Replies: 21
Views: 1139

Re: Economy non-knobblies

pretty much, yes, but it depends how much weight you put over the front end I guess.... Only downside to semislicks is the 'iffy' cornering behaviour when you get leant over...

cheers
by Brucey
4 Feb 2012, 8:08pm
Forum: Bikes & Bits – Technical section
Topic: Economy non-knobblies
Replies: 21
Views: 1139

Re: Economy non-knobblies

a 'semi-slick' then. Can be bought, can be made.... this is how worn-out knobblies end up all by themselves, can be speeded up greatly by suitable application of angle grinder....

:shock:

cheers
by Brucey
4 Feb 2012, 7:29pm
Forum: Bikes & Bits – Technical section
Topic: Hub lubrication covers
Replies: 10
Views: 1045

Re: Hub lubrication covers

They are indeed elderly Record hubs and the clips for some reason have been covered with Campag tape! The other problem is that they are fitted with sprints, so I have to get used to tubs or get them rebuilt for clinchers. eoin If you are not used to adjusting this style of hub you need to do it so...
by Brucey
4 Feb 2012, 7:02pm
Forum: Bikes & Bits – Technical section
Topic: Dumb chain question
Replies: 57
Views: 2000

Re: Dumb chain question

Mick F's comment 'that to all intents and purposes they are the same inner width' is another example of this half-truth and would have you believing that it is OK (say) to use 10speed chain on 6 speed chainrings. Well it might be if they are knackered already but if not it may not work at all and c...
by Brucey
4 Feb 2012, 3:01pm
Forum: Bikes & Bits – Technical section
Topic: Hub lubrication covers
Replies: 10
Views: 1045

Re: Hub lubrication covers

excellent.... back in the day these were held in stock at the LBS and -although they are a tighter fit on many other hubs- I fitted them to others OK. Campy NR hubs are 13.5mm dia and I have fitted the clips onto hubs up to 16.0mm OK, just a bit snug.... BTW Call me an old fart if you like but I sti...
by Brucey
4 Feb 2012, 2:24pm
Forum: Bikes & Bits – Technical section
Topic: Dumb chain question
Replies: 57
Views: 2000

Re: Dumb chain question

I am told that campy chains are 5.9mm width for 10 speed, as are SRAM 10 speed ones. Although the inner chain width also varies, the outer width of a chain is usually the important thing for compatibility. Instant chain expert; 8.0mm = nominal 3/32" width chain for 5,6 or fewer speeds 7.3mm = ...