Search found 32739 matches

by Brucey
20 Mar 2019, 9:04pm
Forum: Bikes & Bits – Technical section
Topic: chain wear; another spot on the graph?
Replies: 9
Views: 858

chain wear; another spot on the graph?

A few months ago I was helping a chum get his training bike set up for winter. A new 10s chain was required at short notice, so a KMC X10-73 was sourced from the LBS and duly went on the bike (together with new chainrings and cassette; a clean slate). We would have used a slightly posher KMC chain h...
by Brucey
20 Mar 2019, 7:52pm
Forum: Bikes & Bits – Technical section
Topic: Building with Sapim CX-Ray spokes
Replies: 19
Views: 1293

Re: Building with Sapim CX-Ray spokes

how's it going, Samuel?
by Brucey
20 Mar 2019, 7:40pm
Forum: Bikes & Bits – Technical section
Topic: Campagnolo/Shimano mix
Replies: 5
Views: 604

Re: Campagnolo/Shimano mix

depends on the age of the RD and the bike really; it ought to work OK but there are various possible problems, e.g. if it is old enough, it may not have the capacity to use as large a sprocket as is often found on a 10s cassette. You will need to use a 10s chain obviously. Another possible snag is t...
by Brucey
20 Mar 2019, 5:39pm
Forum: Bikes & Bits – Technical section
Topic: Rims with decent braking surface thickness?
Replies: 104
Views: 6691

Re: Rims with decent braking surface thickness?

FWIW most tyres are an easy fit onto (old type) open pro rims (now known as open pro C). IMHO quite a lot of conti tyres have been made undersize in recent years, and it is not unusual to find that they are a tight fit onto rims that are in fact not too bad for size. Going from open pro to sputnik i...
by Brucey
20 Mar 2019, 4:19pm
Forum: Bikes & Bits – Technical section
Topic: Rims with decent braking surface thickness?
Replies: 104
Views: 6691

Re: Rims with decent braking surface thickness?

I've seen 1.0mm thickness in the new mavic open pro (-which I thought was unbelievably stupid BTW- ) but in other Mavic models I have not measured less than 1.35mm in a new rim. And I thought 1.35mm was a bit of a joke TBH. In terms of rim stress 65psi on a 1.5" tyre is about the same as ~100ps...
by Brucey
20 Mar 2019, 1:49pm
Forum: Bikes & Bits – Technical section
Topic: Rims with decent braking surface thickness?
Replies: 104
Views: 6691

Re: Rims with decent braking surface thickness?

is the soil especially abrasive where you are? Or is it very hilly? The wear rate of your rims seems a fair bit higher than average....?

cheers
by Brucey
20 Mar 2019, 1:35pm
Forum: Bikes & Bits – Technical section
Topic: Rims with decent braking surface thickness?
Replies: 104
Views: 6691

Re: Rims with decent braking surface thickness?

the spec says it is a sleeve jointed rim, which normally means you need a rim tape. It also says there is a 'zig zag' of a specific size to the drilling pattern which rather suggests that there isn't an offset of the sort that helps to equalise tension, in that if there is such a thing, they would n...
by Brucey
20 Mar 2019, 10:40am
Forum: Bikes & Bits – Technical section
Topic: Driveside Hollowtech11 chainset spacer/washer/seal?
Replies: 17
Views: 938

Re: Driveside Hollowtech11 chainset spacer/washer/seal?

IIRC this part is slightly squashy and helps both to seal and maintain preload on the bearings (even if there is some settling). Often there is one both sides.

cheers
by Brucey
19 Mar 2019, 5:09pm
Forum: Bikes & Bits – Technical section
Topic: Trek 4400 fork swap
Replies: 3
Views: 593

Re: Trek 4400 fork swap

so 1-1/8" threadless steerer, 26" (559mm) wheels? I'm guessing that you need a suspension-corrected fork too. Such things are a bit thinner on the ground than they used to be. One alternative is to use a disc brake at the front and to use a fork that is really meant for fattish 700C tyres ...
by Brucey
19 Mar 2019, 11:47am
Forum: Bikes & Bits – Technical section
Topic: Rims with decent braking surface thickness?
Replies: 104
Views: 6691

Re: Rims with decent braking surface thickness?

fair point about using 'commoditised' parts where possible, on the basis of parts availability. However I'd question whether that really applies to many cycle parts, including disc brake wheels, now or in the future. For example in rear disc brake wheels, you have several possible axle widths, sever...
by Brucey
19 Mar 2019, 11:02am
Forum: Bikes & Bits – Technical section
Topic: decent 1/8th chain
Replies: 19
Views: 1397

Re: decent 1/8th chain

SRAM PC1 chain is the equivalent 1/8" chain today. However this is a bushingless chain. I've been a bit disappointed with those too TBH, but I think they do wear better than the KMC B1. https://www.sjscycles.co.uk/chains/sram-pc1-18-inch-chain-grey/ cheap for the unplated one, but if you want a...
by Brucey
19 Mar 2019, 10:04am
Forum: Bikes & Bits – Technical section
Topic: Problem with rear wheel binding
Replies: 17
Views: 1823

Re: Problem with rear wheel binding

yep that is about it. FWIW when I've had the chance to see how the breakage has been 'timed' to the wheel, it seems like the crack has often started at the front of the axle, rather than the top. This suggests that it is variations in chain tension from pedalling -which are going to be worse in low ...
by Brucey
19 Mar 2019, 9:51am
Forum: Bikes & Bits – Technical section
Topic: decent 1/8th chain
Replies: 19
Views: 1397

Re: decent 1/8th chain

if the (usually sprocket) teeth are even slightly hooked, this is what makes most of the noise. You can 'dehook' the teeth with a bit of cunning grinding action, and this is usually reasonably successful on a SS/fixed/IGH setup, whereas it more usually isn't entirely successful with derailleur sproc...
by Brucey
19 Mar 2019, 9:29am
Forum: Bikes & Bits – Technical section
Topic: What size are the common rack and mudguard fastenings?
Replies: 7
Views: 678

Re: What size are the common rack and mudguard fastenings?

the M5 thread that is used on bikes is (with the exception of a few things such as barrel adjusters on some campag mechs, and some ancient Simplex gear levers) M5x0.8mm. (edit there are also a 3/16" threads -more than one type- that are used on some older frames; but M5x0.8 has been current for...
by Brucey
19 Mar 2019, 9:03am
Forum: Bikes & Bits – Technical section
Topic: Rear derraileur woes
Replies: 5
Views: 834

Re: Rear derraileur woes

oh dear! Shedding the top pulley is not that uncommon in some mech designs. FWIW a lot of more recent RD designs have the top pulley bolt screwing in from the LHS; this is, I believe, to prevent this exact occurrence, i.e. that if the pulley binds slightly, it might unscrew the bolt otherwise. Anywa...