Search found 404 matches

by Keezx
12 Apr 2018, 6:07pm
Forum: Bikes & Bits – Technical section
Topic: Should I replace or repair my broken original Brompton Archer 5 Speed hub?
Replies: 13
Views: 695

Re: Should I replace or repair my broken original Brompton Archer 5 Speed hub?

Had teh same , many years ago, also a folding bike , and repaired it. A small bar in which the pulling pin screws was broken. Not difficult for someone who is familiar with SA 3 speed hubs. After the repair it had only 4 speeds left, the top one was gone, never missed it, the 5 speeds were not the m...
by Keezx
21 Mar 2018, 8:55pm
Forum: Bikes & Bits – Technical section
Topic: Campag/Shimano mix
Replies: 10
Views: 523

Re: Campag/Shimano mix

That's why I use exclusively pre 2007 9 and 10 speed Ergopowers, they never gave me trouble the past 8 years and IF they do, I've numerous spares laying around.
Better avoid any Powershift Ergo's.
The 11 speed Ultrashift ones seem also good, but I don't need nor want 11 speed
by Keezx
16 Mar 2018, 3:01pm
Forum: Bikes & Bits – Technical section
Topic: I should really listen to my own advice more...
Replies: 25
Views: 1343

Re: I should really listen to my own advice more...

So you don't think gussets thicker than frame tubes are a stupid idea?
So buy another similar frame ....
by Keezx
16 Mar 2018, 2:22pm
Forum: Bikes & Bits – Technical section
Topic: Bottom Bracket for a Campag Chorus Triple chainset (2006 year).
Replies: 21
Views: 1167

Re: Bottom Bracket for a Campag Chorus Triple chainset (2006 year).

Main limitation is the size of the seat tube.
On a 28,6 and 31,6 seat tubes the 111 mm BB is fine, on bigger seat tubes you'll need the 115 mm.
by Keezx
16 Mar 2018, 1:28pm
Forum: Bikes & Bits – Technical section
Topic: I should really listen to my own advice more...
Replies: 25
Views: 1343

Re: I should really listen to my own advice more...

Poor construction of that frame....
I guess the designer/builder of that frame never saw this animation, it shows that the lower gussset is completely unnecessary:
Image
by Keezx
13 Mar 2018, 11:35am
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 4797

Re: 25mm tyres

I remain convinced that what you feel while cycling is almost entirely irrelevant to performance and the only way to understand these phenomena is through physics, albeit imaginatively applied. The idea that you can feel any difference in rolling resistance between a 23 mm tyre and a 25 mm tyre is ...
by Keezx
13 Mar 2018, 11:33am
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 4797

Re: 25mm tyres

You seem to have something against physics...... :wink:
by Keezx
9 Mar 2018, 10:28am
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 4797

Re: 25mm tyres

Mick F wrote:
Keezx wrote:You don't have to be a physicist to know that moving mass, once up to speed ,does't need energy to keep moving.
Until you come to a hill.


Still no energy needed for moving/turning the wheel, only for bringing the mass up against gravity.
by Keezx
8 Mar 2018, 7:55pm
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 4797

Re: 25mm tyres

Alan O wrote:
Keezx wrote:You don't have to be a physicist to know that moving mass, once up to speed ,does't need energy to keep moving.

Not in a vacuum with no friction it doesn't, no.


Still, air resistance and friction is independent from mass.
by Keezx
8 Mar 2018, 6:37pm
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 4797

Re: 25mm tyres

You don't have to be a physicist to know that moving mass, once up to speed ,does't need energy to keep moving.
by Keezx
8 Mar 2018, 3:33pm
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 4797

Re: 25mm tyres

I think you got my point. :wink:
On a hilly course 5 kg makes a difference , but 120 grams in the wheels, really?
All over the world people are brainwashed about wheel weights, 1400 grams are light and 1800 grams are boat anchors.
For me it's not much more than fetishism.
by Keezx
8 Mar 2018, 3:14pm
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 4797

Re: 25mm tyres

Then explain to me what difference it makes....(on a flat course), (theoretical and not anecdotal)
by Keezx
8 Mar 2018, 2:30pm
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 4797

Re: 25mm tyres

IF you compare 2 tyre sizes, then you should use tyres with comparable construction/carcass/thread, otherwise it's useless. The 23,25 and 28mm were all Conti Gatorskins. The only difference apart from the size was the weight. Rolling resistance theory says the 28mm should be quicker on the roads in...
by Keezx
8 Mar 2018, 12:50pm
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 4797

Re: 25mm tyres

IF you compare 2 tyre sizes, then you should use tyres with comparable construction/carcass/thread, otherwise it's useless.
by Keezx
5 Mar 2018, 7:25pm
Forum: Bikes & Bits – Technical section
Topic: My Spider is Untrue
Replies: 12
Views: 470

Re: My Spider is Untrue

For what it's worth , I own 5 square taper cranksets (Campagnolo) and 1 external BB (SRAM Force GXP) and the SRAM is the most untrue.
Does'nt give any annoying chain rub, so I ignore it.