Which GP5000 tire width is fastest on HED JET+ wheels (6 and disc) at about 40kph, 23 or 25mm?
Will be used in a new Cervélo P2 frame.
Seen several discussions touching the topic, but could not really find a conclusion in any of the threads. Appreciate your input.
23 mm
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I run 25s on mine front and back. I phoned up hed uk they asked me my weight 83kilos they said run them at 75 psi. The 23 would sit better I’d say but there not exactly mushrooming out much either plus they make the ride alot better very nice over shitty Irish roads.
23 front, 25 rear for me. The 25 is too mushroomy for my taste as a front. The 23 measures 25.6 on my Jet + Rims.
I’m pretty much running the same setup. 2018 Cervelo P2, HED Jet + 6/9. Went with the GP5000 23mm both front and back. I don’t think 25 would have been too bad but not quite as flush as the 23. Ride feel is still really good but I’m also light at 145 lbs
23 front, 25 rear for me. The 25 is too mushroomy for my taste as a front. The 23 measures 25.6 on my Jet + Rims.m
+1. The 25 is a bit chubby on the front. I run 81/75 psi
The tubeless version isn’t available in 23mm so I run 25 TL on my Hed Jet+. The tire measure less than 26 but more than 25mm, I do t remember exactly. So I guess 23 regular is pretty close to 25 TL
Thanks for all your input!
Interesting that 23mm non-TL seems to measure similar as 25mm TL. I plan to ride latex tubes though and hence it seems like 23mm is the way to go.
Anyone seen aero data comparing 23 and 25mm (non-TL) on the HED JET+ to back up that 23mm is the faster setup?
And then, what would be the optimal tire pressure for a 68kg rider on “normal quality” roads for the 23mm non-TL option?
When I emailed Hed I got this reply
Thanks for reaching out, with any of the testing that we do in the wind tunnel we use a continental 5000 tire. What we have found is that 25mm does perform the fastest in the wind tunnel with a 28mm actually being a close second. When moving to a tubeless set up this will save on rolling resistance counter acting the slightly wider tire.
Hope this information helps.
My question was if I should go with the 23 mm Schwalbe Pro one or 25 mm 5000TL
Ok, thanks for sharing the reply from HED. My understanding is though that TL and latex tube perform the same in terms of rolling resistance.
This makes the observation above that 23mm non-TL might have similar width as 25mm TL interesting. Anyone more that have the same experience?
According to Josh at Silca, when when he was at Zipp they did wind tunnel testing showing you want your wheel width to be at least 105% of your measured tire width. Even the 23 may be a little too wide according to that rule on the Hed jet+. I have not measured that tire on my HED wheel but on my Roval which has a really wide internal width they measure 26mm.
Here is some (conflicting) data I collected when trying to answer this question myself:
23 front, 25 rear for me. The 25 is too mushroomy for my taste as a front. The 23 measures 25.6 on my Jet + Rims.
Zipp wheel here and I do the same. 22 front and 25 back. My tire doesn’t come in 23 so had to get 22. Anyway, I read and asked. 25 is not as aerondynsmic as 22 in the front people say.
Can someone tell me what the GP5000 measures on a JET+ either the 23 and/or 25?
I recently installed a 700x23 GP4000 on my JET+ Black and it measures 26.4mm at the widest and I’m curious as to the revised tire’s widths.
According to Josh at Silca, when when he was at Zipp they did wind tunnel testing showing you want your wheel width to be at least 105% of your measured tire width. Even the 23 may be a little too wide according to that rule on the Hed jet+. I have not measured that tire on my HED wheel but on my Roval which has a really wide internal width they measure 26mm.
Here is some (conflicting) data I collected when trying to answer this question myself:
https://forum.slowtwitch.com/...s_P7017817/#p7017817
I think those are charts for tube setups, not tubeless. right??
The OP said he intends to use latex tubes.
I’ve not seen data that shows tubeless pressures should be different than with tubes… only that they can be different because of the elimination of pinch flats.
23 front, 25 rear for me. The 25 is too mushroomy for my taste as a front. The 23 measures 25.6 on my Jet + Rims.
X2 - that’s what I run. Works extremely well. HED also recommends 23mm for front tire on HED plus.
25 cause the 4000 were on sale 
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+1 I ride a 20mm Conti Supersonic. It measures 24.2 at 85psi on my Jet+ Black.
According to Josh at Silca, when when he was at Zipp they did wind tunnel testing showing you want your wheel width to be at least 105% of your measured tire width. Even the 23 may be a little too wide according to that rule on the Hed jet+. I have not measured that tire on my HED wheel but on my Roval which has a really wide internal width they measure 26mm.
Here is some (conflicting) data I collected when trying to answer this question myself:
Had 25 gp 4000s then swapped over to 23 gp 5000s. Both worked really well although I had fitting issues with the jet+ and a 25 on the rear. Hell of a squeeze on a p2. Think the 23 feels faster but no objective data
23 front and back on my jet6/9+.
I think HED used to recommend a 23/25 attack&force combo as the fastest setup for their plus tires, as of a year or two ago. But would have to dig up that thread.