Search found 29202 matches

by Brucey
21 Jun 2018, 1:25am
Forum: Bikes & Bits – Technical section
Topic: RD-M4000 Alivio; suprisingly tough?
Replies: 7
Views: 280

Re: RD-M4000 Alivio; suprisingly tough?

just to clarify, the 10s dyna-sys mechs are not the same design per se; they are similarly laid out but they have a completely different shift ratio to the 9s mechs. I am presently experimenting with adaptations to these mechs to see if they can be converted to other shift ratios BTW. I've seen rela...
by Brucey
21 Jun 2018, 1:05am
Forum: Bikes & Bits – Technical section
Topic: Spacers on a 10-speed chainset
Replies: 3
Views: 116

Re: Spacers on a 10-speed chainset

between dish and offset, chainrings rarely have teeth in the middle of their thickness, which varies anyway. Tooth tops can have chamfers on them too. It all makes a difference. But if you work on the rough idea that the teeth centres should be about 8mm apart then you should be OK, unless the inter...
by Brucey
21 Jun 2018, 12:52am
Forum: Bikes & Bits – Technical section
Topic: Can I ask a quick disc brake question please?
Replies: 12
Views: 254

Re: Can I ask a quick disc brake question please?

sintered pads seem to work best in wet conditions (and also seem to last longest) but they do wear the discs a bit faster than most, and they are often a bit noisier too.

cheers
by Brucey
21 Jun 2018, 12:46am
Forum: Bikes & Bits – Technical section
Topic: 3-cross 32 spoke wheels, which spokes?
Replies: 12
Views: 206

Re: 3-cross 32 spoke wheels, which spokes?

They are not impossible to build with, just more trouble than they are worth if you intended to ride in all weathers and you might want to maintain your wheels or rebuild them using the same spokes. Really they are best suited to fair weather/raceday wheels. FWIW SON delux hub 54mm dia flanges, spac...
by Brucey
20 Jun 2018, 11:30pm
Forum: Bikes & Bits – Technical section
Topic: 3-cross 32 spoke wheels, which spokes?
Replies: 12
Views: 206

Re: 3-cross 32 spoke wheels, which spokes?

Thanks again Brucey. Lasers and Race are about the same price, why do you favor the Race? You have instinctively sided with Sapim over DT, is this unintentional or are they your preferred option (for some reason?)? since you are in Belgium it makes sense to use the local product, no? :wink: The rea...
by Brucey
20 Jun 2018, 11:16pm
Forum: Bikes & Bits – Technical section
Topic: jockey wheels - top - bottom
Replies: 9
Views: 193

Re: jockey wheels - top - bottom

BTW when you have a centre bush that looks the same in shimano top and bottom pulleys, it often isn't; if the lower pulley is a plastic on metal bushing it will have a softer centre part than the upper one if the upper one has a metal on metal bushing. The upper one in such cases is file hard wherea...
by Brucey
20 Jun 2018, 11:11pm
Forum: Bikes & Bits – Technical section
Topic: Can I ask a quick disc brake question please?
Replies: 12
Views: 254

Re: Can I ask a quick disc brake question please?

Ignoring the groove, there is still 1.9mm of friction material remaining. So, they would still be good then. (If not for the damage).... that would make the total pad thickness ~1.5mm (backing) + 1.9mm(friction material) = 3.4mm. It is difficult to be sure but I have to say that your first photo do...
by Brucey
20 Jun 2018, 10:52pm
Forum: Bikes & Bits – Technical section
Topic: jockey wheels - top - bottom
Replies: 9
Views: 193

Re: jockey wheels - top - bottom

If you buy Genuine Shimano ones the top one has a metal centre bonded to the plastic pulley as well as the separate metal sleeve (that is common to both pulley wheels). There are numerous variations to this depending on the quality of the mech. The cheapest shimano mechs have plastic on metal bushi...
by Brucey
20 Jun 2018, 2:54pm
Forum: Bikes & Bits – Technical section
Topic: Can I ask a quick disc brake question please?
Replies: 12
Views: 254

Re: Can I ask a quick disc brake question please?

typical new pads are ~4mm total thickness, being ~1.5mm steel backing and ~2.5mm of friction material. Because the spring does not lie perfectly flat you need at least 1mm, preferably 1.5mm thickness of friction material if you are to be sure that the disc isn't going to (noisily) contact the spring...
by Brucey
20 Jun 2018, 2:45pm
Forum: Bikes & Bits – Technical section
Topic: Broken Balls: How or Why?
Replies: 8
Views: 364

Re: Broken Balls: How or Why?

if the cones are incompatible with the cups then it isn't at all unusual to find that the balls break up (or the cups) before the cones do. Another clue is that the surface of the cone does not have a narrow wear track on it, but instead has a wider area where the balls have been scuffing around. If...
by Brucey
20 Jun 2018, 2:10pm
Forum: Bikes & Bits – Technical section
Topic: Can I ask a quick disc brake question please?
Replies: 12
Views: 254

Re: Can I ask a quick disc brake question please?

you don't say what kind of brake you have. It is difficult to help you if you don't mention this. But I agree with the above; that pad looks worn out to me; if the brake is the sort that uses a spring to hold the pads apart, when the pads are worn so that the friction material is less than 1.5mm thi...
by Brucey
20 Jun 2018, 2:01pm
Forum: Bikes & Bits – Technical section
Topic: SRAM A2 Automatix; introduction to the internals
Replies: 110
Views: 173758

Re: SRAM A2 Automatix; introduction to the internals

not to worry you but this may just be because the dustcap is/was a slightly loose fit (did you remove it before?) but it may also signify that the clipped balls are starting to misbehave in that bearing. In the latter case if the clip starts to break up it can seriously damage or even wreck the hub....
by Brucey
20 Jun 2018, 1:41pm
Forum: Bikes & Bits – Technical section
Topic: Broken Balls: How or Why?
Replies: 8
Views: 364

Re: Broken Balls: How or Why?

7 years! Unless it hadn't moved i'd be servicing the hubs in a tandem at least annually. Even with a light load that rear hub will be taking quite a hammering and needs more regular TLC to keep it running. …. it has apparently done 1000-2000 miles in that time. If your hubs need servicing more ofte...
by Brucey
20 Jun 2018, 8:02am
Forum: Bikes & Bits – Technical section
Topic: 3 to 9W VPG … variable power generator
Replies: 111
Views: 29251

Re: 3 to 9W VPG … variable power generator

just guessing here but maybe Greystoke is using a 'boost capacitor' as per circuits 5,6 here

http://pilom.com/BicycleElectronics/DynamoCircuits.htm

in which case the ideal capacitor rating varies with generator type.

cheers