GK SS 700x43 on Wheels with i19
12-12-21, 11:24 AM
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GK SS 700x43 on Wheels with i19
Has anyone tried the GK SS in 700x43 on a wheel with inner width of 19, if so, how’s the profile of the tire (in terms of cornering, for example)?
Only comparison I can offer: I had 650x47 GKSK on a i19 and did not like the profile, but when I got a i25 wheel built the profile was far better (to me).
Only comparison I can offer: I had 650x47 GKSK on a i19 and did not like the profile, but when I got a i25 wheel built the profile was far better (to me).
12-15-21, 09:57 PM
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The general recommendation is tire width 1.5 - 2.0 times the rim ID - so the combo you are considering would exceed that. Chances are the tire will tend to roll over in corners and not inspire a lot of confidence. That seems to fit with your impression from riding the 25 mm rim.
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12-15-21, 11:20 PM
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I run 44mm WTB Byways on a 24mm rim, and they are really stable - an i19 just seems too narrow.
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12-16-21, 06:18 AM
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Wut? I guess maybe, by 1 or 2 psi, but the actual inflated width of the tire from a 19mm to a 25mm rim could be no difference to a few mm at most. We are talking such miniscule differences, that the psi differences will be more dramatic by changing tire size than rim width.
12-16-21, 06:22 AM
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Thanks.
For now I’ll just stick with the 40mm that are on their, as the profile and handling has been fine on these rims.
A small part of me wants to sell the new 43’s and get same GKSS in 38. While giving up some comfort on rougher terrain, that’s only 10-20% of the riding I’ll do on this mixed surface bike. I’m guessing the 38 would be better on pavement and crushed limestone rail trails...
For now I’ll just stick with the 40mm that are on their, as the profile and handling has been fine on these rims.
A small part of me wants to sell the new 43’s and get same GKSS in 38. While giving up some comfort on rougher terrain, that’s only 10-20% of the riding I’ll do on this mixed surface bike. I’m guessing the 38 would be better on pavement and crushed limestone rail trails...
12-16-21, 08:41 AM
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As for the profile...its something I have never thought of while riding. I weigh 210, run the tires at 40psi front and 45psi rear, and have honestly never thought about the wheel/tire interface while cornering.
I havent thought about it because I havent needed to.
I think that is the best way to describe how the profile is when cornering...Ive never thought about it. Maybe I corner too slow?...or maybe I dont overthink such details?
If this were something I had to think about when riding, then the profile probably isnt ideal because I will have felt it rolling from under me or something. When riding, I cant see the profile from above and when not on the bike, the unloaded profile is meaningless.
There appears to be an abundance of caution in this thread. A 19mm internal rim can handle a 43mm tire just fine.
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12-16-21, 11:12 AM
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12-18-21, 12:38 AM
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That’s called a distinction without a difference.
20% is very specific, and I’m really struggling to wrap my head around the advice that a wider rim, which means a possibly larger inflated size, means 20% more pressure. But, again, as I said above, based both on actual experience and obsessive reading on the subject, a tire won’t see a dramatic increase in its inflated size (as measured on the outer sidewall dimension using a calipers), maybe 1-2 mm, on a larger rim (unless I guess we are talking about going from a 19 to a 35, but then you wouldn't be mounting the same tires either. Larger volume takes more air to inflate. But we don’t measure the volume of air we put in the tire, only the pressure, and last I checked larger volume tires can be run at lower pressures for both better feel and handling. If there is any required increase in pressure, it’s likely because you are using cheap tires with a low TPI and stiff sidewall, maybe a few psi at most, more likely 1-2 which is a distinction without a difference.
20% is very specific, and I’m really struggling to wrap my head around the advice that a wider rim, which means a possibly larger inflated size, means 20% more pressure. But, again, as I said above, based both on actual experience and obsessive reading on the subject, a tire won’t see a dramatic increase in its inflated size (as measured on the outer sidewall dimension using a calipers), maybe 1-2 mm, on a larger rim (unless I guess we are talking about going from a 19 to a 35, but then you wouldn't be mounting the same tires either. Larger volume takes more air to inflate. But we don’t measure the volume of air we put in the tire, only the pressure, and last I checked larger volume tires can be run at lower pressures for both better feel and handling. If there is any required increase in pressure, it’s likely because you are using cheap tires with a low TPI and stiff sidewall, maybe a few psi at most, more likely 1-2 which is a distinction without a difference.
Last edited by Badger6; 12-18-21 at 06:10 AM. Reason: typo
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12-18-21, 01:52 AM
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Has anyone tried the GK SS in 700x43 on a wheel with inner width of 19, if so, how’s the profile of the tire (in terms of cornering, for example)?
Only comparison I can offer: I had 650x47 GKSK on a i19 and did not like the profile, but when I got a i25 wheel built the profile was far better (to me).
Only comparison I can offer: I had 650x47 GKSK on a i19 and did not like the profile, but when I got a i25 wheel built the profile was far better (to me).
https://www.schwalbe.com/files/schwa...ationen_EN.pdf
Whats wrong with the profile? Did you read a bunch of marketing blurb about "bulbous" tyre shapes that is supposedly "bad" ;-) Cant imagine you can actually feel any difference what so ever. Except maybe at very low pressure.
Last edited by Racing Dan; 12-18-21 at 02:02 AM.
12-18-21, 06:09 AM
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Do what you want, but the point of using wider rims and larger volume tires is to “soften" the ride. Which, is not the point of the OP’s question, in fact, it wasn’t even the question…but, alas, here we are, again.
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12-18-21, 08:29 AM
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A small part of me wants to sell the new 43’s and get same GKSS in 38. While giving up some comfort on rougher terrain, that’s only 10-20% of the riding I’ll do on this mixed surface bike. I’m guessing the 38 would be better on pavement and crushed limestone rail trails...
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12-18-21, 10:29 PM
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My limited anecdotal opinion is wider is better. The GK SS in 700x43 will be fine on an i19 rim, but it will feel better on an i25 rim.
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12-19-21, 01:55 AM
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OP is talking about handling in cornering. Therefore, tire pressure will matter and there's a difference in inflation pressure between different width rims even if using the same tire. I only mentioned about ride comfort to further illustrate my point there's a difference.
When I swapped wheelsets on my bikes with different rim width, I kept using the same old tires and inner tube so I know a change in rim width has significant influence in ride comfort and handling in cornering and you may have to change inflation pressure if applicable.
When I swapped wheelsets on my bikes with different rim width, I kept using the same old tires and inner tube so I know a change in rim width has significant influence in ride comfort and handling in cornering and you may have to change inflation pressure if applicable.
