It will be very fast as long as it has a narrow enough tire/tub.

How narrow would you say is narrow enough?

20mm

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Be sure not to put it in backwards. Valve goes on the right-hand side.'

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Assuming it is a clincher, Conti SS 20mm is the tire. Stock up with 2 or 3 because they probably won't be around for too long with the move to wide rims. This is still one of the fastest front wheels in low yaw applications.

^^^^This.

The HED/Specialized trispoke design is still one of the fastest front wheels you can get. Still used by lots of top TTers.

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Yes it is a clincher with an aluminum brake track. Ended up getting the disc and HED for 400 which seemed like it would be a fairly good upgrade. The disc only had a couple of time trials on it and that is it. I will start doing some searching and stock up. Thanks to everyone for the input.

The H3/Renn combo has been the classic Slowtwitch wheel set-up since the beginning of ST. I'm a fairly recent H3 convert, after years with different Zipp front wheels. My wheel came with a new Conti SS 20mm and all I got was flats. I use Conti GP4000 20front/23rear and give up a little on the rolling resistance but have better flat protection.

The H3 design is now over 20 years old and it's still one of the fastest front wheels. Renn discs have proven themselves in a lot of races. You have gotten a great deal and a huge improvement over your other wheels

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''Sweeney - you can both crush your AG *and* cruise in dead last!! 😂 '' Murphy's Law

Same combination but on the tubular H3 and Renn. Skinny tubulars are getting hard to find too.

My Challenge Cronos (quoted at 22mm) measured a little narrow (when new) if that helps ?

Latex tubed but not quite as true / well made as the Pro 4's I have just put on.

Pro 4's are quoted as 23mm but the eyeball test says there's more than 1mm between the two types.

Can get the vernier out if your interested.

WD :-)