TT Tubular Tyres size and best

wacka

Hi

What's the best size of tubular tyres for my Zipp 404 front and Zipp Super9 Disc rear, I've heard 25mm is the best for the rim width.

Also, which tyre is the best recommended? Looking at Conti Podium TT or Competition tyres.

Cheers

sungod

i think zipp say to match width for minimum drag

after that, for tt minimum rolling resistance, scroll down this page for table...
http://www.bicyclerollingresistance.com ... ke-reviews

bear in mind the lowest crr tyres will have less puncture resistance than tougher ones

matt_n-2

Silca did a big test on tyre width vs rim width, generating the 105% idea: https://silca.cc/blogs/journal/part-5-t ... rodynamics

404 are around 26.4mm wide, so a 25mm tyre would match well.

I've got 25mm Corsa Elites on my 303s which are also 26.4mm wide.

wacka

So by ordering Conti Competition 25mm Tubs is a good thing then?

charlie_potatoes

I see the 25mm myth persists

http://zipp.com/_media/pdfs/technology/ ... _speed.pdf

sungod

that's a 2007 article, for current rims, zipp says...

Firecrest wheels with wider tire beds
The best aero and lowest rolling resistance is obtained with front 23mm and rear 25mm width tires running at the recommended tire pressures.

sungod

Wacka wrote:

So by ordering Conti Competition 25mm Tubs is a good thing then?

depends what is 'good' for you

cons: they're not especially low crr and they ride like hosepipes

pro: they're tougher than tyres with lower crr/better ride, they also have good wet grip

charlie_potatoes

sungod wrote:

that's a 2007 article, for current rims, zipp says...

Firecrest wheels with wider tire beds
The best aero and lowest rolling resistance is obtained with front 23mm and rear 25mm width tires running at the recommended tire pressures.

It's a very recent change though Isn't it?

But if anything it backs up my hunch that the whole 25mm is faster thing is a big con. Wheel manufacturers having to change rim designs to back up the claims.

simon_masterson

If using as dedicated TT wheels and you aren't riding out to events, go for Veloflex (ideally Record) or Vittoria (new Corsa Speed are meant to be good but pricey). Challenge Crono is also a good cheap choice.