Tire (Width & Heigth) vs Rim Width - GP5000

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Data points of 30/32mm GP5000 on wider rims, specifically height, would be most helpful.
Here's what we've gathered so far ("HL" - hookless-only datapoints - more data needed):

[Jaisen]

GP 5000 S TR 700x28 on Roval Terra CLX II's (25mm ID): WAM 31.3, HAM 25.8, thread width 28.8.
GP 5000 S TR 700x28 on Shimano C36's (21mm ID): WAM 29.7, HAM unknown, thread width unknown.

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GP 5000 S TR 700x28 on Roval Terra CLX II's (25mm ID): WAM 31.3, HAM 25.8, thread width 28.8.
GP 5000 S TR 700x28 on Shimano C36's (21mm ID): WAM 29.7, HAM unknown, thread width unknown.

Updated, thanks! Interesting that the height actually dropped on wider rims.

More data points on the same specs are welcome, I'll average them out.

[ultimobici]

It’s obvious that height would drop as the rim’s internal width increases.


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[Hexsense]

Height shouldn't actually drop with wider rim if the tire casing is the same.

narrow tire casing on wide rim can be as wide as wide tire casing on narrow rim. But it's not as tall (less height).

But if we fix tire (unmounted, measured flat) casing width constant, wider rim should just make tire significantly wider and a tiny tiny bit taller.

Ps. Hookless sometime result in a taller tire, as the casing is more straight rather than having to navigate around hook.

[Jaisen]

GP 5000 S TR 700x28 on Roval Terra CLX II's (25mm ID): WAM 31.3, HAM 25.8, thread width 28.8.
GP 5000 S TR 700x28 on Shimano C36's (21mm ID): WAM 29.7, HAM unknown, thread width unknown.

Updated, thanks! Interesting that the height actually dropped on wider rims.

More data points on the same specs are welcome, I'll average them out.

The height is almost the same, there is a 0.4 mm difference between your measurement and mine. That could easily be due to tire manufacturing tolerances, calibration of instruments used, or differences in how we individually measured.

[Jaisen]

I know it isn't exactly what you are looking for, but it can help put things in context. Notice that your HAM and mine were almost the same going from 19 ID rims to 25 ID rims. So there isn't too much difference happening in HAM across different ID of rims. Where we do see a big change is across WAM when comparing rims. The second place we see big variations is across different tire sizes, and here BRR has nice data. They compared 700x25 vs 700x28 vs 700x30 vs 700x32 on 17.8mm ID rims with GP 5000 S TR.

700x25: WAM: 25.3, HAM: 22.1.
700x28: WAM: 28.0, HAM: 25.4.
700x30: WAM: 29.8, HAM: 27.2.
700x32: WAM: 31.4, HAM: 28.8.

https://www.bicyclerollingresistance.co ... comparison

So we can guesstimate that if you had 700x32 your max height as measured across different ID sizes would be <30mm and likely close to 29mm. Similarly, you can expect around 34-35mm WAM using a 700x32 on a 25 mm ID rim. I have a different set of tires from Vittoria that were 700x31 that I fitted on my 25mm ID rims and they came out at 34mm WAM.

If people can fill in your table with actual data, fantastic, but you can get a pretty good idea with the data we have available.

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Thank you for the input!

Ps. Hookless sometime result in a taller tire, as the casing is more straight rather than having to navigate around hook.

Good point, as I'm actually targeting a hookless rim. That makes things even harder to predict.

So we can guesstimate that if you had 700x32 your max height as measured across different ID sizes would be <30mm and likely close to 29mm. Similarly, you can expect around 34-35mm WAM using a 700x32 on a 25 mm ID rim. I have a different set of tires from Vittoria that were 700x31 that I fitted on my 25mm ID rims and they came out at 34mm WAM.

If people can fill in your table with actual data, fantastic, but you can get a pretty good idea with the data we have available.

I noticed that too, but I believe this might be due to inaccuracy in our measurements when based on just one estimate. Evidence shows, that the wider the rim, the taller the tire should be:


So I believe we'd need more data points of the same tire on different rim widths.

[TobinHatesYou]

Different tire pressures result in different WAMs / RAMs, folks.

[UrgentDelay]

Different tire pressures result in different WAMs / RAMs, folks.

To a certain extent, yes. The assumption is we're taking measurements at recommended pressures for different widths. These differences would be minuscule anyway, but you're right in the principle.

[TobinHatesYou]

Different tire pressures result in different WAMs / RAMs, folks.

To a certain extent, yes. The assumption is we're taking measurements at recommended pressures for different widths. These differences would be minuscule anyway, but you're right in the principle.

Every 20psi is like .3mm with 28mm GP5K S TR. Some of the data you’ve scraped from the threads is mine, and I don’t think I’ve always used the same pressures for my WAM measurements. I’ve always provided the psi value though and try to get measurements for new and broken-in tires.

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Every 20psi is like .3mm with 28mm GP5K S TR. Some of the data you’ve scraped from the threads is mine, and I don’t think I’ve always used the same pressures for my WAM measurements. I’ve always provided the psi value though and try to get measurements for new and broken-in tires.

Yes, I tried pulling as much data from the forum as possible. That 0.3mm is not nothing, but I doubt that the standard deviation of tire pressure among riders on the forum would be close to that. Thanks for the input anyway. Still looking for those 30cc and 32cc measurements

[satanas]

I don't see why the OD of the tyre should change much with rim width - the circumference in the centre isn't going to change(!) so unless the pressure is dramatically different and the tyre shrinks (wider rim => lower pressure), or grows (narrower rim => higher pressure), then only the cross section ought to change with rim width, assuming you're not trying to put a 25mm tyre on an i30mm rim or suchlike.

[JWTS]

28mm 5000s, 21 internal/hooked, 68 psi: 29.2W, 27.0H
32mm 5000s, 25 internal/hookless, 54 psi: 34.2W, 25.0H

hope that helps.

FWIW, I look on this forum every now and then to see if I'm missing something as far as tires are concerned (something new and better). For a race tire, there are certainly some better/riskier options. For an everyday fast tire though, it's just hard to beat the 5000s. I just pulled off a rear that had about 7000kms on it. Several hundred of those were on good condition gravel. The tire was down to the casing in several spots and bleeding sealant throughout, and lived almost its entire life with a Dynaplug installed. One flat that didn't self-seal (second ride on the tire, Dynaplug fixed it in less than a minute), and the tire performed perfectly. Hard to ask for more out of a tire this fast. I typically run the 32's between 30-48 psi (30 for the rides including gravel), and they're plenty comfortable at those pressures. Pretty amazing tire.

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28mm 5000s, 21 internal/hooked, 68 psi: 29.2W, 27.0H
32mm 5000s, 25 internal/hookless, 54 psi: 34.2W, 25.0H

hope that helps.

FWIW, I look on this forum every now and then to see if I'm missing something as far as tires are concerned (something new and better). For a race tire, there are certainly some better/riskier options. For an everyday fast tire though, it's just hard to beat the 5000s. I just pulled off a rear that had about 7000kms on it. Several hundred of those were on good condition gravel. The tire was down to the casing in several spots and bleeding sealant throughout, and lived almost its entire life with a Dynaplug installed. One flat that didn't self-seal (second ride on the tire, Dynaplug fixed it in less than a minute), and the tire performed perfectly. Hard to ask for more out of a tire this fast. I typically run the 32's between 30-48 psi (30 for the rides including gravel), and they're plenty comfortable at those pressures. Pretty amazing tire.

It does help, thanks! I'm updating the table. Interesting to see the 32cc drop 4.8mm in height going from 19 internal to 25 internal. My bet was that it would be taller. 34.2 is also narrower, I expected c.a. 34.9 wide from extrapolation.

Concerning GP5000s, a friend recommended to me Pirelli P Zero or Michelin Power Cups as more comfortable, but he also admitted having to change the tyres 3 times as often. I'd say that's pretty uncomfortable. They're also around 5W slower, so I'll be sticking to GP5000s for now too.