251W is the obvious answer, power of the crowd for the run, no worries.
Or there is this:
From:
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Yes.
But Iād done LOADS of outdoor rides on the TT bike at race power and for race duration and above.
It was more confidence than anything.
210-230 sounds reasonable for you 
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I think 210 sounds under for you, thatās my target power but Iāll take anything over 200w average. Thatās off my TT position FTP of 240w ish.
Edit: although at 0.87 IF that does sound a bit high. Maybe Iām the one who needs to revise targetsā¦
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Uh it doesnāt really work like that
And this only works if your FTP is reasonably correct, a Zwift value from a smart turbo may be nothing like your real FTP measured by a power meter.
If it is, then 75% is a good ball park. Imo.
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I did it in 2019. My NP was 230. I crumbled on the run so perhaps a bit too much for me. Or lack of JFDI! Actually, I think it was related to not enough food on the bike.
My FTP back then was apparently 310 but this was based on a turbo that is known to over read. Perhaps 290 was more accurate so around 80%.
Iād do your brick at 235w as you originally said and see how you get on.
Enjoying reading all the strategies for the big race, should be a good day out!
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Ok. Thanks for all those words of wisdom. Going to try a ride at 235W now & then see how the run feels after. Engaging full dork mode too with pointy hat and everything.
Mainly posting here to make myself accountable and not sack off the run later
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Is that FKW Skyā¢ļø, too?
With a disc wheel also?
Do you have TrainingPeaks or Intervals.ICU?
Iām interested to see that stats for this ride
(No sarcasm there, either, I actually am!)
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Beat me to it
Team Sky 
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Iād say @fruit_thief 's approach probably be the best? Rather than calculating an FTP and picking an IF to ride to, which has may variables. However reality is, for most people going to ride a balls out effort on the exact same course isnāt feasible, so the estimation (FTP) approach is more practical.
And both approaches are kind of linked arenāt they? A pure TT could use the same FTP and IF approach, but have a higher IF as they donāt need to consider the swim & run.
So you might have an FTP of 300. A balls out TT could be 0.9 IF (270W) and a tri bike split might be 0.8 IF (240W). On that basis the tri bike split is 89% of the pure balls out TT.
Now thereās nothing to say that riding at 240W does mean youāll have an optimum run, but Iād say that arguably if youād proven you could ride it balls out at 270W taking 89% of that to get 240W would give me more confidence of the 240W rather than just taking 300W FTP from an indoor ramp test.
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My eyes!
Eh?
In what world?
If youāve an FTP of 300W, a 25TT should be done at FTP, or just over (if youāre a >41kmh rider)
For a 10TT, probably 305-315W.
Otherwise your FTP isnāt correct 
FWIW: this year, Iāve done 336W for 20 minutes outdoor on the road bike hauling my IPA-laden ass up a hill.
Iāve also done 309W indoors on the TT bike, as a proper test. But you donāt need to concentrate indoors, you can just put your head down and pedal.
Last year, I managed 303W for a 10TT.
So I reckon Iām about right.
Got a TT tonight, but no mates to chase, so reckon itāll be more like 285W, as I really CBA when itās just me 
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But we are talking a 50TT here, or a 56ml HIM bike leg.
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Weāre talking specifically about the 113 (56 miles) bike leg, but I was just plucking numbers from thin air to demonstrate the point.
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Hmm. It has been an educational morning. Main lesson learned is that riding on roads is full of every sort of danger. White vans, tractors, landrovers with horseboxes, traffic lights, roadworks. Donāt these guys appreciate youāre trying to hold constant power? 
. Also had a brown shorts moment when I rode straight over something big hard and lumpy, maybe a rock or part of a car, on the main descent. Rear wheel puncture but managed to stay upright.
In terms of riding at 235W, which is about 82% of alleged FTP, well it felt ok for the first hour. RPE 5 to 6. But into the second hour it was feeling harder, RPE 7 to 8 by the end.
Got off the bike feeling ok though and trotted out on a run, first 6km felt fine but then I started to get little cramps in left VMO. These didnāt actually get much worse but my pace started to slow by about 20s/km for the same HR and RPE.
And this was only 60/12km
So I reckon 235W is too high. Might try again in a week or two, slightly longer, but aiming for 230 and see how the 2nd half of the run feels thenš¤
Or might just stay on Zwift for the rest of my life because the roads are terrifying, take care out there folks 
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Do it every week. And take off that hill, thatās probably making your power a bit higher and āstressingā some muscles out.
Stake your claim on the road and youāll be āreet 
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Never going within 5 miles of that hill again, it just tried to kill me . Trouble is there are similar hills in every direction. itās pretty impossible to find a flat route here. Might have a look at the maps though & see
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You can cope with the boredom on Zwift, so apply that to the roads.
Try and plot a route with left turns and roundabouts, that way pesky traffic lights and traffic donāt hold you up and you can just swoop round everything.
It doesnāt have to be a loop - it can be an out and back, or a loop, then reverse, with a few dog legs etc.
Hereās one of mine - all left turns, RABs or straight over at quiet/great visibility crossroads
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These donāt apply to cyclists do they? Thatās what I keep reading in the Dauly Mail comments anyway.
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No only road tax payers have to obey traffic lights.
Speed limits are for skateboards only as well
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Hmm, somebody seems to be taking this a bit more seriously all of a sudden 
3 swims and some focused bike sessions!
Sandbaggers beware 
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