Numpty IM Bike Thread - Page 5 - Triathlon

2 trenches

26/07/2005 at 10:05

LOL!

Even for the most anal of cyclists, the weight saving from switching CO2 to usual air is minimal at best.

A large fart will have a similar effect.

TwoDogs

26/07/2005 at 10:18

here's a numpty bike question: Wtf are "tubs"?

cougie

pirate

26/07/2005 at 10:22

Tubular tyres. So they are like a tyre and innertube sewn up together. You glue them onto a rim which is different to the normal wheel rims.

Lighter and more responsive but pricier.

quimby

26/07/2005 at 10:23

Tubular tyres. Instead of the tyre being "open" at the bottom, where it fits onto the rim, the outer tyre encloses the inner tube completely, in a tubular style. They stick onto the rims with rim cement or tape.

candy ollier

26/07/2005 at 10:24

rosey, i think its somethong to do with how it responds to heat. maybe it expands/contracts more than air does? i can't see that it makes much difference though.

Gumps

26/07/2005 at 10:24

Tyres come in two versions - Tubular (Tubs) and Clincher.

Clincher are the ones used on most bikes and are the tyre/inner tuber combination most are familiar with. THere are cost savings with this as punctures mean only a change of tube and they are generally harder wearing. They are slower than tubs.

The easiest way to think of a tub is of just an inner tube stuck to the wheel. They are made of a different material and can be reapaired by resticthing whihc is quite difficult. They are speedier than clinchers but not very hard wearing. The ponces use these for racing

2 trenches

26/07/2005 at 10:24

Tubular tyres - there are 2 types, tubulars (or tubs) and clinchers (or wire-ons).

Clinchers have 2 parts - a u cross sectioned thick rubber trye, and an inner tube. They are easy to change, cheap to replace and generally used by everyone.

A tub is in essence a very very thick inner tube (or a tyre with a circular cross section), which is glued on to the wheel rim. These are more expensive, temperamental to change (though with practice it's easy), but are generally considered to run a little bit faster. You can also inflate them to a higher pressure.

To be honest, there's very little between the performance between the two, but clinchers are easier and cheaper to run.

candy ollier

26/07/2005 at 10:30

i prefer tubular tyres for safety reasons. if you're going fast and clinchers blow out, you're screwed. i had a blow out at only about 40mph and i did a triple summersault with the bike still attached to my feet. luckily i always wear a helmet.

if you're doing more than 50.... well, maybe you should pin a note to your saddle saying what music you'd like to have played at your funeral.

tufo clincher tubs are safer, but they are a pain to fit onto clincher rims.

smiley lady (M.)

26/07/2005 at 10:32

only 40mph! help

2 trenches

26/07/2005 at 10:37

FB hit 70mph in switz didn't he?

candy ollier

26/07/2005 at 10:39

that's gravity for you!

smiley lady (M.)

26/07/2005 at 10:42

thud!
I get scared doin' those kind's of speeds in a car with a 5* safety rating ... what's it gonna be like when all that's between me and 6 months in a cast is my wits?

popsider

26/07/2005 at 10:43

I was meaning to ask you all about that - do you think that was for real or something interfering with the computers. It does seem awfully fast - how steep was the hill?

fat buddha

26/07/2005 at 10:46

109.2kph or about 68mph was my top speed...............a PB by 7kph!!!

the thought of coming off at that speed - whatever tyre I had - does not bear thinking about.............

that speed is close to the top speed recorded in the TdF by Sean Yates at about 73mph on the descent form the Col du Tourmalet..........

strange - both Sean and I ride Omega bikes!!

candy ollier

26/07/2005 at 10:47

frighteningly steep. the first time down i got into a shimmy, the worse one i've ever seen (even worse than the one i got into at IM Lanzarote tearing down a volcano on a horribly bumpy road with a 40mph tail wind!). i tried to brake but it just got worse, so i just had to stay on.

half way down i saw all the ambulances attending two mangled cyclists.

near the bottom, a marshall made frantic "slow down" gestures to me. i'd love too, but how?

rosey did close to 55mph there, but both barlist and fb beat it. both are, err, of generous proportions!

fat buddha

26/07/2005 at 10:51

pops - the hill I recorded the speed on was pretty steep and smooth so rolling resistance was low..................although the computer may not be absolutly accurate it certainly "felt" like 70mph........and I was close to that speed on all 3 descents according to the computer so I guess is pretty true...........plus I am close to 16stone so have a very good gravity effect!!

popsider

26/07/2005 at 10:52

Rosey is a pretty fearless descender too - sounds nasty, take it there were no bends to negotiate. I think I'd bottle it before 60mph.

cougie

pirate

26/07/2005 at 10:52

My speedo only hit about 45mph there, but its not working properly. Frickin' Cateyes. I finished on 103 miles or something.

It was a good hill Pops - faster than anything I've ridden in the UK.

candy ollier

26/07/2005 at 11:00

pops, there was a sharp left at the bottom! the hills were quite bad, as they all had twisties at some point.

the reason that austria is much faster as the descents are more gentle and straight - so you can get down on the tribars and go for it. oh, and the hills aren't as long.

i understand that Germany is pretty much similar to Austria, or at least closer to austria than it is to switzerland

2 trenches

26/07/2005 at 11:01

Jo - I would think that 6 months in a cast would be the best case scenario if you came off at that speed.