I have hed jet 6+ and hed disc + pair
Was using Continental attack/force 2 tire combo (they are 22/24 mm)
Now it is time to purchase new tires and want to try Continental Grand Prix TT, but can not choose 23 or 25 mm or 23 front and 25 back
What are suggestions? Anyone used Continental Grand Prix TT un Hed + rims?
23 in the front and 25 in the back
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I traded a bunch of emails with a HED SME before I bought mine, and they feel pretty confidently that the fastest tires on their current Jet+ wheels are the Attack/Force 23/25 combo.
business up front, party in the back
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I’ve got 25mm Vittoria G+ on my HED Jet 6 Black - they inflate about a mm or so on each side past the width of the rim.
23 mm in the front for aerodynamics. IMO, there is very little difference between a 23 or 25 in the rear. When both tires are inflated to their optimum pressures, their crr are essentially the same.
current Jet+ wheels are the Attack/Force 23/25 combo.
Better than TT ?
When both tires are inflated to their optimum pressures, their crr are essentially the same.
What width are TT’s 23 and/or 25 tires when inflated on jet+?
Might be should go both 23mm? Someone has tried 23 versus 25 mm at the back and noticed some differences?
Where’s the current best place to purchase Conti TT 25s???
Better than TT ?
I did not ask specifically about the TT. Though, these are his words:
Attack is still the most aero tire for a plus wheel but we can now safely recommend a 23 or 24mm tire for the fastest balance of aero and rolling resistance on a smooth road. If the roads are not in excellent shape, then a 25mm tire is no slower than 23mm.
23 mm in the front for aerodynamics. IMO, there is very little difference between a 23 or 25 in the rear. When both tires are inflated to their optimum pressures, their crr are essentially the same.
That’s not true.
business up front, party in the back
You know it. I am ridin’ a rubber mullet!
Corsa Speed 23 both front and rear.
23 mm in the front for aerodynamics. IMO, there is very little difference between a 23 or 25 in the rear. When both tires are inflated to their optimum pressures, their crr are essentially the same.
That’s not true.
key word from my post: “optimum pressure”.
Yes when a 23 mm and 25 mm are inflated to the same pressure, the 25 mm has a better crr… and your graph states the assumption of equal pressure. But why would you run a 25 mm at the same pressure of a 23mm on the road (assuming the 23mm pressure was optimized for the surface)? The 25 mm would likely be pogo sticking off the ground (assuming same surface) which is not very fast. So you run a lower pressure on the 25mm tire thus increasing the 25mm tire crr which ends up right around the same as the 23mm.
There has been some talk about this previously.
There has been some talk about this previously.
Yes, BryanD is behind the times. The current Slowtwitch doctrine is that Crr is largely independent of width given optimum tire pressure.
Which simplifies things. Width buys comfort. Narrowness buys CdA. Fortunately given that most late-generation wheels are super wide, 23mm is now “narrow”. And that’s fairly comfy. I used to do TTs on like 18mm tires pumped to diamond-creating pressure, and that was no fun on chipseal.
Haha. I read his post wrong. I see my mistake.
Comparing Conti TT 23/25mm set to Force/Attack 3 witch is also now 23/25mm
As I understood correctly TT is little less rolling resistance but bit more puncture probability.
Hard to decide on that one, think I will try TTs to get that marginal gain 
As I understood correctly TT is little less rolling resistance but bit more puncture probability.
And the TT is potentially higher aerodynamic drag than the Attack. So, the the challenge is if the TT is lower Crr, does that offset its potentially greater aerodynamic drag.
Comparing Conti TT 23/25mm set to Force/Attack 3 witch is also now 23/25mm
As I understood correctly TT is little less rolling resistance but bit more puncture probability.
Hard to decide on that one, think I will try TTs to get that marginal gain
Conti sure seems to slice the “clincher race tire” segment into pretty thin sub-segments, making it hard to choose. I understand that the GP4000SII is the slowest but most durable offering, with enough tread depth and puncture resistance to be an every day tire. And the Super Sonic is (supposed to be) the lightest, lowest .crr tire but with the least flat protection. That leaves the TT and Force/Attack combo, which I understand to both be in between the 4000SII and Supersonic in terms of performace/puncture resistance, but it’s far from clear what the differences between the two are and why you’d choose one over the other. Seems to me that one model between the 4000SII and Supersonic would suffice, really.