I would guess ~300W or a tiny bit less at your weight on a flat course, but you could also use BestBikeSplit as a reality check.
I’ve gone sub-hour on ~230W (6’2" 165lbs)
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250W or less if you have a good position. Way over 300W if you have a sucky position.
250 for what type of person ? length weight ?
I hate you.
My wife has gone 58:05 on around 230 watts (no power meter in race but that was best case scenario ftp at the time). She has about the best position I have ever seen on a tt bike though so that helps. Alot. As in more than anything else.
I would guess ~300W or a tiny bit less at your weight on a flat course, but you could also use BestBikeSplit as a reality check.
I’ve gone sub-hour on ~230W (6’2" 165lbs)
Wow, nice. Would you mind posing your equipment and position? My questioning it, just like to see what others are doing that I might be missing.
250 for what type of person ? length weight ?
They could be 7 feet tall and 300lbs for all I care. Only thing important at that point is W/CdA. Being short/small can certainly help, but there are plenty of tall people who can get very slippery.
6 ft 2, 78-80kg depending on where I’m at in a training cycle. I can usually hit sub 60 on a relatively flat course.
My latest sub 60min 40k bike was done off 275-280 watts FTP (my FTP test of 275 was two weeks old, the next test of 280 came a month afterwards). Average power 228, NP 233, av HR 144
Weather was overcast, temp around 22c, slight headwind coming back (out and back x2 lap course, quite straight road)
I used my canyon speedmax, HED 60 front, HED disc back, one bottle cage with round bottle, evade helmet, decent position (could be lower at the front, and arms more together), fusion short sleeved suit.
I could have shaved some more time off by spending money on updating my bike fit, switching back to giro advantage helmet, securing my race number with two belts and smartening up my start line.
Edited to include watts not just FTP
I would guess ~300W or a tiny bit less at your weight on a flat course, but you could also use BestBikeSplit as a reality check.
I’ve gone sub-hour on ~230W (6’2" 165lbs)
Wow, nice. Would you mind posing your equipment and position? My questioning it, just like to see what others are doing that I might be missing.
Nothing special, just cumulative marginal gains:
Trek Speed Concept 7.5 (2014), size largeHed Jet+ 6/DiscContinental Attack/Force, latex tubes (sometimes 23mm GP4000s in pace of the Force)BTA (I switch amongst a few different ones)Scott Split aero helmetIn the pictures below I’m wearing a Virklon speed suit that I was experimenting with last year but I have a PI Octane that I think is faster (from field testing). This year I’m going to a two piece setup. First picture really doesn’t give a true sense of my position as the camera was tilted. It makes me look much slacker than I really am. I’m pretty narrow up front which you sort of get an idea from my second picture. My current position is just a touch lower than pictures 2/3 and I have a very slight mantis. Also, I ditched the mono ski bend extension for s bends.
My wife has gone 58:05 on around 230 watts (no power meter in race but that was best case scenario ftp at the time). She has about the best position I have ever seen on a tt bike though so that helps. Alot. As in more than anything else.
Whoa…that’s pretty damn good.
Can you share her height/weight, PM used, etc.?
A photo of her TT position would be awesome.
I DO realize that I’m asking for a photo of YOUR wife, so no worries if this post is ignored. 
You guys must race pig slow courses. I did a 57:10 off 225W 5ft 8 170lbs two days after an ironman to stay in my local TT league. Old P2 deep front wheel and a disc. My position would be considered good but not superb in TT circles.
300w and my good bike and I’d be wanting to go 51ish on a good day condition wise with my good kit.
I didn’t do the whole 40k but I averaged 25mph for 50min (40.something km/h) during a tri on 239W. I’m 71kg.
Flat course in Miami (a few bridge climbs). This is on an old P2C with Flo 90/disc, omega brakes etc… very clean. Apparently my CdA is close to 0.2150 according to best bike split’s estimate.
I’ve also done a 2:19 (24mph) 70.3 split on 219W on my new Trek SC 7.5 so the numbers make sense.
I went 59 minutes or so on about 260 watts. Flat course, little bit of wind but nothing crazy. I’m 5’9, 175-180 lbs.
Gear: p3, wheel cover, jet 60 front, giro advantage helmet and a rather lousy skinsuit.
Best bike split seems to overestimate my times on the courses I’ve mapped it on.
Another data point, I went 1:00:13 (so close) at Nats last year on a 2002 Cervelo One (round seat tube, no cutout, etc), but with a good bike fit though, LG Vortice helmet, Flo disk and 60mm front. I’m 6’1" and weighed 180 lbs at the time, averaged 285 watts.
I must be an absolute rolling billboard.
51 Yrs male 5ft 10 180lbs.
Never tried a 40K TT but best in Olympic is 60 minutes at 222W for 22.3.
FTP around 250
I don’t know about others, but mine are done as part of an oly tri and not a TT.
I would guess ~300W or a tiny bit less at your weight on a flat course, but you could also use BestBikeSplit as a reality check.
No way. 300w with a decent position at around 170 will get you there way faster than an hour.
I would say 250 - 260w for an hour would give you 40km/hr speed.
I agree. I do near an hour with 6 stop signs at that power (same weight). On a flatish to small roller course 280w gets me 25mph+ @ 170 lbs.
More important question. What do you need to do to go under 50 min?
My height/weight are identical to yours and pushing 290W gets me 61-62 minutes, hence my original guess of 300W for this guy who is 170lb. This thread makes me want to go back to my fitter…
Well, there’s your problem. Most professional fitters prioritize comfort first and speed second. Plus it’s all eyeball speed anyway (except for the handful of fitters that also do aero testing, and I think calling them “fitters” doesn’t do them justice). You’re losing serious watts somewhere, trust me.
At my last TT of the year, put my bike side by side with a guy my size who chronically underperforms, and who’d had a professional fitting that season. Showed him that my armpads were much lower and further forward than his. Don’t know what he’ll do with that knowledge but I was giving him the tools to start beating me.
More important question. What do you need to do to go under 50 min?
Slightly better than 1600 w/m^2.