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by Brucey
11 Mar 2019, 2:55pm
Forum: Bikes & Bits – Technical section
Topic: Normandy hubs; maillard in many guises....
Replies: 35
Views: 1759

Re: Normandy hubs; maillard in many guises....

for rim brakes a maillard front hub (MTB or tandem) with 1/4" balls is a pretty good choice for tandem use. If you want one I am pretty sure that I have one somewhere. IIRC solid axles are 3/8" x 26tpi in this model and cones etc are the same as in rear hubs using 1/4" balls. The 3/8&...
by Brucey
11 Mar 2019, 2:25pm
Forum: Bikes & Bits – Technical section
Topic: Truly Awful Brake Performance
Replies: 9
Views: 799

Re: Truly Awful Brake Performance

the rim hasn't got an anodised braking surface, has it? FWIW it usually takes one wet ride for the brakes to bed in. New brake blocks can have mould release compound on them , which could now be transferred onto the MA3 rim. If you then tried the same brake blocks on other rims, the brake blocks wou...
by Brucey
11 Mar 2019, 2:20pm
Forum: Bikes & Bits – Technical section
Topic: New ETRTO / ISO rim and tyre standards coming down the pipe
Replies: 4
Views: 755

Re: New ETRTO / ISO rim and tyre standards coming down the pipe

very interesting. Hopefully it will solve the worst of the problems, which are summarised in the illustration below; https://cdn.shopify.com/s/files/1/0202/9884/files/Diagram_Tires_1024x1024.jpg?v=1499979714 However bitter experience suggests that whatever standard is adopted, it won't stop rim and ...
by Brucey
11 Mar 2019, 1:28pm
Forum: Bikes & Bits – Technical section
Topic: wheel building
Replies: 13
Views: 1079

Re: wheel building

Tucking the last crossing under also gives you maybe a millimetre more clearance to the Rear mech. in bottom gear, and it all counts. Yes indeed; I have even seen wheels where just one spoke has been replaced, without bracing the crossing, and that spoke has touched the RD. However there is a confl...
by Brucey
11 Mar 2019, 1:12pm
Forum: Bikes & Bits – Technical section
Topic: Catastrophic spoke failure. While stored..
Replies: 31
Views: 2114

Re: Catastrophic spoke failure. While stored..

the only surface treatments (apart from polishing) that I know of on stainless spokes are chemical/oxidising treatments that are carried out to render some stainless spokes black. It isn't clear to me that such treatments don't make the spokes a little more likely to break.

cheers
by Brucey
11 Mar 2019, 1:07pm
Forum: Bikes & Bits – Technical section
Topic: Rims with decent braking surface thickness?
Replies: 91
Views: 4861

Re: Rims with decent braking surface thickness?

Well, to complete this thread, my newly-ordered H Plus Son Archetype rims arrived last Friday and were duly measured. Braking surface thickness turns out to be ~1.5mm on one side and ~1.3mm on the other, again (badly?) machined sidewalls, despite costing twice as much as the rims previously used (E...
by Brucey
11 Mar 2019, 7:54am
Forum: Bikes & Bits – Technical section
Topic: Normandy hubs; maillard in many guises....
Replies: 35
Views: 1759

Re: Normandy hubs; maillard in many guises....

did your 1968 hubs have drilled or slotted flanges? I'm not exactly sure when slotted flanges started.

cheers
by Brucey
11 Mar 2019, 7:32am
Forum: Does anyone know … ?
Topic: Brompton equivalent
Replies: 22
Views: 3068

Re: Brompton equivalent

well this thread has gone a bit weird; it presently looks as if I started this thread, which I didn't. I posted a reply to a query (from Hondated?) about buying an equivalent to a Brompton, but that initial question has seemingly been deleted. Very odd.

cheers
by Brucey
11 Mar 2019, 7:22am
Forum: Bikes & Bits – Technical section
Topic: wheel building
Replies: 13
Views: 1079

Re: wheel building

If you get hold of a Raleigh from the 1950s, it is odds-on that the wheels will be built with the crossings unbraced. Their wheels often used 14G spokes in the rear and 15G in the front. To this day if you buy a Gazelle, the wheels are similarly likely to be built unbraced. Typically they use 14G fr...
by Brucey
11 Mar 2019, 12:50am
Forum: Bikes & Bits – Technical section
Topic: Catastrophic spoke failure. While stored..
Replies: 31
Views: 2114

Re: Catastrophic spoke failure. While stored..

it might well be 'the neighbour effect'. When a single spoke breaks the average tension in the wheel probably reduces, but the spokes immediately adjacent to the broken one (and on the same side of the wheel) usually see a tension increase, and this may be enough to tip them over the edge if they ar...
by Brucey
11 Mar 2019, 12:35am
Forum: Bikes & Bits – Technical section
Topic: Why the sudden urge to ride bikes on gravel?
Replies: 171
Views: 6140

Re: Why the sudden urge to ride bikes on gravel?

GCN = Gormless Content Normally....?
by Brucey
11 Mar 2019, 12:27am
Forum: Bikes & Bits – Technical section
Topic: wheel building
Replies: 13
Views: 1079

Re: wheel building

there are several reasons including 1) the spokes are less likely to resonate and make a noise as you ride 2) under some loading conditions (eg high torque) one spoke of each crossing pair can be going slack; when braced thusly the spokes are less likely to go completely slack and therefore it is le...
by Brucey
10 Mar 2019, 7:27pm
Forum: Bikes & Bits – Technical section
Topic: loose nut on crankshaft, but tighten too much and can't pedal
Replies: 18
Views: 1282

Re: loose nut on crankshaft, but tighten too much and can't pedal

on many bikes the crank fits onto the bottom bracket spindle via a 'square taper' interface. It sounds like yours has loosened and then worn, such that it won't stay put if it is retightened.

The usual cure for this is a new crankset.

cheers
by Brucey
10 Mar 2019, 5:14pm
Forum: Bikes & Bits – Technical section
Topic: Normandy hubs; maillard in many guises....
Replies: 35
Views: 1759

Re: Normandy hubs; maillard in many guises....

in addition to the above the photo below shows some other variants Image01375.jpg From left to right a) Normandy hub (1977) with 'lipped locknuts' from a Raleigh (a kind of precursor to lawyer's lips). Even in this scabby state this hub will polish up nicely. This style of hubshell persisted until a...
by Brucey
10 Mar 2019, 4:15pm
Forum: Bikes & Bits – Technical section
Topic: Moulton front suspension arms
Replies: 29
Views: 1408

Re: Moulton front suspension arms

if there were a special tool you can be sure that they would sell it at some exorbitant price.

What you dismissively refer to as 'heath robinson' works perfectly.

Beauty is as beauty does and all that.

cheers