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by Brucey
17 Aug 2018, 11:53pm
Forum: Bikes & Bits – Technical section
Topic: Self maintenance advice,
Replies: 26
Views: 733

Re: Self maintenance advice,

worth mentioning that third party websites lack detail in many cases. This being the case it is always worth checking the manufacturer's website for technical manuals. For example when overhauling a GXP bottom bracket for the first time it is well worth while reading the SRAM technical manual; there...
by Brucey
17 Aug 2018, 10:52pm
Forum: Bikes & Bits – Technical section
Topic: Another Shopper - general modernisation questions
Replies: 10
Views: 628

Re: Another Shopper - general modernisation questions

another front brake option is to use one of these; https://www.sjscycles.co.uk/images/products/medium/31068.jpg https://www.sjscycles.co.uk/brakes/diacompe-brs101-front-track-frame-brake-25-mm-clamp-fitting-silver/ but 'as is' it only works with a skinny tyre of some kind. I daresay that something s...
by Brucey
17 Aug 2018, 10:40pm
Forum: Bikes & Bits – Technical section
Topic: TRP Spyre Disc Brakes - Not Impressed.
Replies: 59
Views: 1646

Re: TRP Spyre Disc Brakes - Not Impressed.

judder is a weird one; IME it is more often caused by the disc itself than the pads or the caliper (although a badly aligned caliper can help to cause it too) . The fork will resonate back and forth at a specific frequency in any system, and it seems that this resonance can be excited whenever that ...
by Brucey
17 Aug 2018, 10:07pm
Forum: Bikes & Bits – Technical section
Topic: Do cassettes wear faster than chainrings?
Replies: 20
Views: 352

Re: Do cassettes wear faster than chainrings?

I guess if you are either going up or going down, your most used gear (certainly by time if not miles per se) might well be a climbing gear. 26T chainrings do tend to make the chain tension quite high, and anything that mashes (soft) chainrings up presumably isn't that far from wearing sprockets eit...
by Brucey
17 Aug 2018, 9:13pm
Forum: Bikes & Bits – Technical section
Topic: Ti frame crack safety - urgent
Replies: 15
Views: 364

Re: Ti frame crack safety - urgent

quite a few Ti frames crack lengthwise in the chainstays. This normally happens because of the way the frames are made, not because of the service stresses. I am assuming that the crack is lengthwise because you say it is 2" long. Provided the crack remains a lengthwise crack only then the fram...
by Brucey
17 Aug 2018, 4:21pm
Forum: Bikes & Bits – Technical section
Topic: Do cassettes wear faster than chainrings?
Replies: 20
Views: 352

Re: Do cassettes wear faster than chainrings?

Cassettes don't wear specifically, it's the smaller sprockets that wear. Usually that means a new cassette, but it's possible to replace individual sprockets especially if you have Shimano or Miche. Campag is prohibitively expensive to buy them individually. Not on my cassettes it isnt. Second or t...
by Brucey
17 Aug 2018, 2:56pm
Forum: Bikes & Bits – Technical section
Topic: Do cassettes wear faster than chainrings?
Replies: 20
Views: 352

Re: Do cassettes wear faster than chainrings?

as a chain wears to (say) 1% the roller contact climbs 1% up the teeth. 1% of a chainring radius is much larger than 1% of a sprocket radius, so the wear that creates the hooking shape is far more spread out on faces of the chainring teeth. Note also that hooked chainring teeth rarely create a major...
by Brucey
17 Aug 2018, 2:42pm
Forum: Bikes & Bits – Technical section
Topic: Slipping stokers stem
Replies: 13
Views: 322

Re: Slipping stokers stem

Brucey: would you care to comment on the fact that the stem is attached to a seat post? Does that create any issues/incompatibility in terms of fit/size? SOP for tandems, at least for the last 70 years or so.... There are a few that are not like that, but not many traditional style ones. Speaking o...
by Brucey
17 Aug 2018, 1:23pm
Forum: Bikes & Bits – Technical section
Topic: Slipping stokers stem
Replies: 13
Views: 322

Re: Slipping stokers stem

I don't think there is such a thing as a tandem where the rear handlebars cannot move (and/or turn the seat pin) should the stoker try with any degree of force. In terms of not upsetting the whole plot, the ideal stoker is not unlike a sack of potatoes(*); control is easiest if the stoker doesn't mo...
by Brucey
17 Aug 2018, 11:54am
Forum: Bikes & Bits – Technical section
Topic: Do I need a new cassette and/or chain ?
Replies: 38
Views: 976

Re: Do I need a new cassette?

cheers indeed! BTW if the chain lifetimes in the test data seem short, they are arguably under conditions that are about as bad as you might get in service; as per the footnotes in the provisional 10s result the chains are run 'as is' for five hours and then subjected to doses of water, sand and oil...
by Brucey
17 Aug 2018, 11:39am
Forum: Bikes & Bits – Technical section
Topic: TRP Spyre Disc Brakes - Not Impressed.
Replies: 59
Views: 1646

Re: TRP Spyre Disc Brakes - Not Impressed.

... before ' downgrading ' to BB5/BB7 IME don't bother with BB5: BB7 much better. (I don't doubt that BB5s can be made to work reasonably well in some circumstances, but definitely didn't work well for me!) IME BB5 can work well enough for most folk; there are means of coping with the issues that a...
by Brucey
16 Aug 2018, 10:34pm
Forum: Bikes & Bits – Technical section
Topic: Self maintenance advice,
Replies: 26
Views: 733

Re: Self maintenance advice,

can I be a BOF and suggest a good book as a useful starting point? You will of course have to dip into the internet for new stuff as it comes along but a good book will prime you on a lot of the background, language, principles etc without which you could read a hundred websites and look at as many ...
by Brucey
16 Aug 2018, 7:07pm
Forum: Bikes & Bits – Technical section
Topic: Brompton mods - 2x3 gearing to 3x3
Replies: 13
Views: 519

Re: Brompton mods - 2x3 gearing to 3x3

three choices of shifter 1) thumbshifter SL-S50, but modified 2) SA twist shifter TSS56 HP (query whether this is for (W) or non (W) hub; can't be both....) 3) SA trigger shifter DLS52 (HSJ958) . washer is HMW147. It is also a good idea to fit a slimmer locknut on the RHS. You will need to have a BW...
by Brucey
16 Aug 2018, 6:41pm
Forum: Bikes & Bits – Technical section
Topic: Do I need a new cassette and/or chain ?
Replies: 38
Views: 976

Re: Do I need a new cassette?

get at least two further new chains and run them both for at least a couple of hundred miles (to test them) before you go away. If you might need a spare chain en route, have it posted on ahead.

cheers
by Brucey
16 Aug 2018, 4:38pm
Forum: Does anyone know … ?
Topic: ...how easy or difficult it is to make money in the cycle trade?
Replies: 9
Views: 478

Re: ...how easy or difficult it is to make money in the cycle trade?

most of the LBSs I know of are hoping to survive by offering good quality/speedy repairs, good customer service, and niche products of various kinds, sometimes wholesaling them. They are selling fewer complete bikes and fewer basic accessories; most of the parts they sell are as part of a repair of ...