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23 or 25mm GP5000 on HED JET+ at about 40kph?
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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.
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [Hising] [ In reply to ]
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23 mm

Matt
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [Chemist] [ In reply to ]
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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.
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [seanmcl] [ In reply to ]
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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.
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [Hising] [ In reply to ]
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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

Dominic Pollizzi

Last edited by: zestypollizzi: Sep 14, 19 13:56
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [endosch2] [ In reply to ]
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endosch2 wrote:
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
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [Hising] [ In reply to ]
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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

Personal best:
Ironman 9:22:02
Ironman 70.3 4:20:00
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [teinvall] [ In reply to ]
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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?
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [Hising] [ In reply to ]
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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

Personal best:
Ironman 9:22:02
Ironman 70.3 4:20:00
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [teinvall] [ In reply to ]
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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?
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [Hising] [ In reply to ]
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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

-------------
Ed O'Malley
www.VeloVetta.com
Founder of VeloVetta Cycling Shoes
Instagram • Facebook
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [endosch2] [ In reply to ]
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endosch2 wrote:
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.
Last edited by: s13tx: Sep 15, 19 12:11
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [Hising] [ In reply to ]
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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.

-------------------
Madison photographer Timothy Hughes | Instagram
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [RowToTri] [ In reply to ]
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RowToTri wrote:
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??
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [Cookiebuilder] [ In reply to ]
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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.

-------------
Ed O'Malley
www.VeloVetta.com
Founder of VeloVetta Cycling Shoes
Instagram • Facebook
Last edited by: RowToTri: Sep 15, 19 7:38
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [endosch2] [ In reply to ]
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endosch2 wrote:
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.
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [BT_DreamChaser] [ In reply to ]
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25 cause the 4000 were on sale :P

The entire event (IM) is like "death by 1000 cuts" and the best race is minimizing all those cuts and losing less blood than the other guy. - Dev
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [RowToTri] [ In reply to ]
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+1 I ride a 20mm Conti Supersonic. It measures 24.2 at 85psi on my Jet+ Black.

RowToTri wrote:
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

What's your CdA?
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [trailerhouse] [ In reply to ]
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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
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [Hising] [ In reply to ]
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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.
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [jonmhicks] [ In reply to ]
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Thanks again for all the input!
Seems like some kind of consensus that 25mm is too wide for the front, but might be ok for the rear aero wise (even though it is a tight fit in a P2 frame).

What makes earlier recommendations a bit hard to interpret is that the GP5000 is a bit narrow compared to for example GP4000.

And still not much data - there must be tests out there somewhere!
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [Hising] [ In reply to ]
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Hising wrote:
Thanks again for all the input!
Seems like some kind of consensus that 25mm is too wide for the front, but might be ok for the rear aero wise (even though it is a tight fit in a P2 frame).

25 is not at all a tight fit in a 2014-2019 P2 Frame. You just need to adjust the small hex set screws that are in the horizontal rear dropouts. You will need to back them out a little to pull the rear wheel away from the seat tube. For some reason most P2 owners have no idea they are there and this question comes up on ST about once a month.
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [teinvall] [ In reply to ]
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teinvall wrote:
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

My experience with the Pro One compared to the Corsa Speed G+ is that the extra rolling resistance is pretty noticeable, but the 5000 TL is on par. I can’t imagine that the minimal drag difference between the 23 Pro One and the 25 5000 TL would outweigh the RR penalty.
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [Mudge] [ In reply to ]
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That’s why I got the 5000TL. And I found a google spreadsheet where someone put together where actual tire width of different tires and sizes was measured on different wheels. And Schwalbe 23 was wide and continental 25TL was more true to size.

Personal best:
Ironman 9:22:02
Ironman 70.3 4:20:00
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Re: 23 or 25mm GP5000 on HED JET+ at about 40kph? [teinvall] [ In reply to ]
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Can you post that spreadsheet?

2024: Bevoman, Galveston, Alcatraz, Marble Falls, Santa Cruz
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