Search found 729 matches

by alexnharvey
23 Oct 2019, 8:19am
Forum: Bikes & Bits – Technical section
Topic: Hand built wheels.
Replies: 17
Views: 646

Re: Hand built wheels.

With regard to number of spokes my own experience is that 36 is the minimum for any full size (26” and upwards) wheel, using less is effectively asking for trouble. YMMV, as they say. What trouble have you experienced with wheels with fewer spokes than 36? I've only built a couple of wheels, one re...
by alexnharvey
22 Oct 2019, 6:02pm
Forum: Bikes & Bits – Technical section
Topic: BB30
Replies: 7
Views: 275

Re: BB30

Can we assume that you have previously been able to achieve smooth running with another BB and crankset and if so what type? What is the frame?
by alexnharvey
16 Oct 2019, 5:48pm
Forum: Bikes & Bits – Technical section
Topic: New wheels for my steel framed racer ?
Replies: 10
Views: 422

Re: New wheels for my steel framed racer ?

Debs wrote:Very interesting bicycle wheel build shop in Bristol

https://www.ryanbuildswheels.co.uk/


''e sells cheap spokes too.
by alexnharvey
15 Oct 2019, 6:00pm
Forum: Bikes & Bits – Technical section
Topic: Gluing aluminium sleeve back into press fit BB
Replies: 8
Views: 350

Re: Gluing aluminium sleeve back into press fit BB

Is it five minute araldite that you have?

How big is the gap between sleeve and frame? Do you need to find it in alignment whilst it's setting and how can you check it is ok?
by alexnharvey
15 Oct 2019, 8:54am
Forum: Bikes & Bits – Technical section
Topic: Amusing video about Cervelo being shoddy
Replies: 19
Views: 934

Re: Amusing video about Cervelo being shoddy

I think it's called a race to the bottom.
by alexnharvey
13 Oct 2019, 12:53pm
Forum: Bikes & Bits – Technical section
Topic: Amusing video about Cervelo being shoddy
Replies: 19
Views: 934

Re: Amusing video about Cervelo being shoddy

I've watched a few of those 'Hambini' videos and find them a bit cringeworthy to be honest. I've no doubt that the things he says are true, (and as an engineer myself I know some of them are true) but his delivery is far too over the top for me to watch too many. I guess that his delivery is part o...
by alexnharvey
13 Oct 2019, 11:34am
Forum: Bikes & Bits – Technical section
Topic: Noisy DH-3N20; guessing game...?
Replies: 16
Views: 760

Re: Noisy DH-3N20; guessing game...?

An escaped bearing or remnants, stuck to the magnet and knocking against the shell?
by alexnharvey
11 Oct 2019, 10:56am
Forum: Bikes & Bits – Technical section
Topic: Shimano hub cones - common/interchangable?
Replies: 8
Views: 456

Re: Shimano hub cones - common/interchangable?

Thanks Brucey. I can't quite articulate the question but essentially are the curves and angles designed so that as the loads go on the ball bearing wants to remain running on the diameter rather than scuffing, it's kind of self aligning.
by alexnharvey
10 Oct 2019, 5:05pm
Forum: Bikes & Bits – Technical section
Topic: Single source for rim ERDs?
Replies: 14
Views: 506

Re: Single source for rim ERDs?

I use Leonard's calculator most of the time. The open rims and hub database of freespoke makes searching by ERD much simple.
by alexnharvey
10 Oct 2019, 1:05pm
Forum: Bikes & Bits – Technical section
Topic: Shimano hub cones - common/interchangable?
Replies: 8
Views: 456

Re: Shimano hub cones - common/interchangable?

Where could one find a good explanation of the geometry of cup and cone bearings, how the curvature and angle of each is set wrt the other and the ball, how this varies with expected axial and vertical loads. Are the curved surfaces simple, constant radius or are they more complex with decreasing ra...
by alexnharvey
8 Oct 2019, 6:18pm
Forum: Bikes & Bits – Technical section
Topic: "Gusset" under downtube
Replies: 67
Views: 2021

Re: "Gusset" under downtube

I would like to think that these gussets are fitted with prior attention to the guage of the tube at the lower join of the gusset. The butted section of tubes are often of a set length and the tubes are cut to size to suit the bike. This can leave quite short sections of 'thick' tube and it's quite...
by alexnharvey
5 Oct 2019, 5:13pm
Forum: Bikes & Bits – Technical section
Topic: "Gusset" under downtube
Replies: 67
Views: 2021

Re: "Gusset" under downtube

I whittle my bikes in the middle of the tubes, not at the ends where they see the highest stresses.
by alexnharvey
4 Oct 2019, 4:15pm
Forum: Bikes & Bits – Technical section
Topic: Front and two rear lights from one dynamo?
Replies: 15
Views: 484

Re: Front and two rear lights from one dynamo?

Are you running a single wire or a double wire to the rear currently?

The easiest way to me seems to be splitting at the rear of the bike, by connecting two new pieces of wire to the current end(s) and then connecting these to each light.

Assuming they're both led lights it should work just fine.