we have a new big man!
Kevevs - Member
this is about bikes isn't it?
yes - if you don't understand just ask, please dont' flame.
You asked the question, I answered it
What would we be putting out (fnaar) a 20mph? 300W?*
If you don't like the answer, fine. FWIW the 20mm will make a great pair of wheels. The 50s will be faster on anything except a straight hillclimb up a steep hill. If anything, your overestimation will make the theoretical differences between the two smaller.
Enjoy your wheels.
🙄
njee - is that a winter bike/mudguards with winter kit on etc
More recently yes, that's based on doing 20 minute intervals at c290w, I'll average about 20mph on rolling terrain.
You asked the question, I answered it
In Al's defence, you didn't really, just shot down his methodology for quite a while! You're clearly a strong rider, I'd not be able to sustain anywhere near 20mph for a solo century, I'd suggest plenty of riders would be nearer to 300w without your '8ft/150kg/bolt upright' analogy!
You're clearly a strong rider, I'd not be able to sustain anywhere near 20mph for a solo century
Really? I've managed that - though admittedly not on sportive type roads, and I think the only times I've actually averaged over 20mph were on my TT bike (best of almost 23mph 😀 ) I'd have thought you were easily capable of that if you spent more time training on the road and getting a good aero position. I'm probably a lot more aero than most, but I'd estimate my power for 20mph at somewhere around 210W (I don't have a power meter on a bike - that's based on my sustained power on a supposedly accurate trainer, and what equivalent effort gets me on the road).
They look good, what hubs are you using?
I chickened out of the self build on cheap hubs as i came into so more money, so bought Velocity aeroheads on pro3's from JRA. Should have em in a couple of weeks I think.
See my 2nd post...you keep on letting moi down :
Hmmm 😕
Must just be me then - I regularly average >210w riding to and from work, and that sure as hell isn't anywhere near 20mph! Admittedly the traffic lights slow me down though, and bias the power slightly as you get 30 five second intervals of 700w+
I'm not particularly un-aero I don't think - I found the front end of my Allez so ridiculously high compared to what I was used to I had to take out all the spacers including the upper headset race and buy a -12 degree stem! I genuinely don't know how people can ride bikes with such long head tubes - I feel like a bloody sail!
Mudguards will kill your aero, that'll account for a lot, as will your 'rolling' terrain. That covers a wide range of possibilities!
I'm not that strong, there are many out there with similar figures and, unfortunately, quite a few with better.
If you're 68kg and doing 2x20 at ~290W then you're more than capable of shifting along at well over 20mph for a few hours. 255W ave on my TT bike got me a sub 4-hr 100m TT.
Gav i went for the Alpha 340's Tubeless is so smooth and no punctures this year so far !!!!!
Wheel weight comes in at a very respectable 1225g for the pair 😀
LS -Member
Mudguards will kill your aero, that'll account for a lot
I say again...any stats for that? Sounds well over the top.
About 15W. Quite handily I've turned this summer's road bike into the winter one with only the addition of guards (and some Ay-Ups on the bars but I doubt they'll have much effect) so I've been able to see how much difference they make.
If you think about it a front guard is blocking the gap where air can pass through between wheel and crown so won't be doing much good. Having said that I have guards with a front flap which is stuck out in the airflow, I bet that makes more difference than anything.
Will that do or do you require a meta-analysis of several studies before you believe me? 😆
Will that do or do you require a meta-analysis of several studies before you believe me?
Peer-reviewed please.
Blimey.
Power meters sound fun, do they cost a bomb?
