On Sun, 19 Nov 2017 08:15:53 -0800, Joerg
wrote:

On 2017-11-18 18:22, John B. wrote:
On Sat, 18 Nov 2017 07:30:41 -0800, Joerg
wrote:

On 2017-11-16 17:05, John B. wrote:
On Thu, 16 Nov 2017 16:23:34 -0800, Joerg
wrote:

On 2017-11-16 16:09, John B. wrote:
On Thu, 16 Nov 2017 15:28:13 -0800, Joerg
wrote:

On 2017-11-16 13:21, Tosspot wrote:
On 16/11/17 20:38, David Scheidt wrote:
Tosspot wrote:
:Why do they have holes in them?

:Car discs don't, motorbike discs don't, aircraft discs don't. Why do
:bicycle discs have them?

Lots of high-performance car brake rotors are drilled or slotted.
Slotting is more common on better stuff, holes can crack. They serve
a couple of features. One, people think they're cool. two, they
allow the gasses that come off brake pads somewhere to go (this is a
non-issue with modern pads, but it was a problem in the dark ages).
Three, they give water somewhere to go. Four, they improve cooling
(increase surface area). five, the clean pads, and reduce wear.

Gasses off a bicycle pad? Really?

Nobody drills rims, and most[1] motorbikes, which are exposed to the
rain don't.

Because 75 kg of me at 30 kph is the same KE as 160 kph Audi at 1.5
tonnes? Nah.

Hmmm...could it be it helps to clean them? They aren't dissipating the
KE, so they don't get Eeek! hot. But surely the crud would build up in
the holes?

I'm going to order a solid one for the front and fit it in the spring
and see if it makes any difference.


If you find a place (in the US or China) that sells solid 8" or 203mm
rotors please let us know.


https://www.amazon.com/SRAM-Guide-Ul.../dp/B00XAY7CYK
or
http://www.jensonusa.com/SRAM-Guide-...te-Disc-Brake/
The SRAM brake Ultimate Brake with 950mm front discs and 1,800 rear
discs.


Quote "ROTOR SIZES: 140, 160, 170, 180, 200mm"

I've got that already. It's not solid rotors.


I assume these are for the "go fast people".


What's so special about this stuff other than very high prices?

Good Lord! It is made by SRAM and everyone knows that they build super
stuff. Some of which is even used on TdeF racing bicycles :-)


Oh, yes, right. We must bow down deeply and I should never complain
about having to pay 10x or more than my current solution. Another
confession. I use $10 T-shirts on all my rides instead of $100
technicolor Spandex.

Current solution?


I had described it more than once now: Shimano RT-66 rotors with 203mm
and Promax Decipher hydraulic brakes. Worked very nicely on a short test
ride. Wanted to do a long ride on Friday but it had rained and my wife
didn't want to see a mud-dripping MTB and rider in the garage again. So
I took the road bike out west instead. Went through almost 2ft deep
water and thanks to our wood stove the shoes are just now dry again.


... Like the hose clamps to keep the front fork bearings
from falling off?


That hose clamp works poifectly.


But more to the point $10 for a tee shirt? That is (last time I
checked the exchange rate) 330 baht for a tee shirt? Absurd, I buy
tee shirts for 100 baht each, six for 500 baht.


We can get them for that price as well. However, then the collars wear
out faster and become floppy. Also, I need 100% cotton and of good
quality. Not something super-thin that unravels at the first brush with
a blackberry bush.

You need to do more research. The 100% cotton are the cheap ones.

But I don't understand the demand for high quality tee shirts. after
all you have extolled us with your stories of riding with ragged
shorts and sandals but you just got to have a beautiful tee shirt to
go with the rags?

Ten dollar tee and ragged shorts and no shoes? Amazing!
--
Cheers,

John B.