this is me 6 months ago…sorry folks
Fixed that for you H.
I’d rather have heavy tyres and light wheels than light tyres and heavy wheels… wouldn’t you? :roll:
If you’re not racing - which I think is safe to assume - then there is nothing to worry about. B43s look better.
No.
Your perspective is mass, because you’re a weight weenie (and I mean this in the nicest possible way!), and for your wheels, you should be concerned about minimising mass at the outer edge of the wheel, to make acceleration easier, so putting heavy tyres at the extreme edge isn’t a good idea. If mass(tyre + rim) is the same in both cases, and both tyres have the same RR, then the heavier rim combo will be easier to accelerate and lower angular momentum.
However, I’m referring to rolling resistance, which can’t be accurately quantified in a lab (tyre running on a steel drum, which is what German mag Tour do in Conti’s lab.) as road imperfections have an effect. It comes down mostly to carcass suppleness, tread compound thickness/tackiness, tyre width & inflation pressure. The percentage differences in time are far far larger than the effects of bike mass & aerodynamics. It’s the single biggest bang for buck mod you can make.
Which tyre comes up trumps?
sorry horatio and xbrendanx. I actually dont have em yet. Im quite new to fixed gears so i wouldnt have anything to compare it to.
I don’t subscribe to Tour, nor do I speak German, and their results are only applicable to riding on steel plates.
However, from some real world roll down tests, Pro3Races in a 25mm are quite good (better than 23 & 21, and if they made a 28 it’d be a winner), I’ll have to come back later with some other good un’s. I recall that Gatorskins are surprisingly good too.
Not sure I agree/understand this.
If you have a heavy wheel like a B43, the majority of the weight will be at the edge anyway, so what’s the difference?
alright, then try this. take whatever bike you have and ride it up a hill.
then put a brick in your backpack and do the same ride.
then tell me what the difference was.
or fuck, you could even walk up the fucking hill.
Horatio:
For the same mass, the further away it is from the hub, the harder it will be to accelerate the wheel. Tyres are further than rims. QED.
Chris:
Play around here:
http://analyticcycling.com/
(You’ll probably love this too H., and there’s a whole “velodrome” section xBBx)
But a heavy tyre/light wheel combo will never weigh the same as a light tyre/heavy wheel if you get me?
I shall check out said website, thankyou.
You missed my ‘frictionless vacuum’ [1] assumptions, and it’s possible when you consider that a light tyre is ~200g and a heavy one 800+g, allowing a wide range of rim weights.
800g road tyre WTF?
sorry man. i’ll be sure not to do it again.
http://www.schwalbetires.com/marathon_plus
25mm: 580g
28mm: 740g
45mm: 1070
You’re reading too much into this H., it’s a theoretical argument, if you’re concerned about rotating mass then you’ll have light rims, tyres, veloplugs & alloy nipples.
Okay you’re speaking my language now thankyou!
I guess it’s that time of year now isn’t it Horatio?
hahaha