Go Back  Bike Forums > Bike Forums > Cyclocross and Gravelbiking (Recreational)
Reload this Page >

GK SS 700x43 on Wheels with i19

Notices
Cyclocross and Gravelbiking (Recreational) This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like : "Unbound Gravel". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

GK SS 700x43 on Wheels with i19

Old 12-12-21, 11:24 AM
  #1  
Noonievut
Senior Member
Thread Starter
 
Join Date: Sep 2009
Posts: 791
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 222 Post(s)
Liked 118 Times in 75 Posts
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).
Noonievut is offline  
Old 12-15-21, 09:57 PM
  #2  
Chilepines
Senior Member
 
Join Date: Jul 2020
Location: New Hampshire
Posts: 155

Bikes: 1984 homemade 531SL road bike; 1988 Ritchey TimberComp; 1997 Nashbar tandem; 1998 Kona Explosive; Specialized Epic, Scott CR1 Pro; Salsa Beargrease; Curtlo custom Tandem.

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 57 Post(s)
Liked 38 Times in 28 Posts
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.
Chilepines is offline  
Likes For Chilepines:
Old 12-15-21, 11:20 PM
  #3  
SquishyBiker
Senior Member
 
Join Date: May 2020
Location: Auckland, NZ
Posts: 103

Bikes: 2014 Avanti Circa (Rd Dist), 2020 Giant Toughroad (Rd Tour), 2021 Trek Allant+ 8S (eCommute), 2021 Scott Aspect 940 (Mt HT), 2014 Santa Cruz Superlight 29er (Mt FS), 2022 Scott Spark 960 (Mt FS)

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 32 Post(s)
Liked 49 Times in 25 Posts
I run 44mm WTB Byways on a 24mm rim, and they are really stable - an i19 just seems too narrow.
SquishyBiker is offline  
Likes For SquishyBiker:
Old 12-16-21, 06:18 AM
  #4  
Badger6
Obsessed with Eddington
 
Badger6's Avatar
 
Join Date: Jun 2013
Location: Brussels (BE) 🇧🇪
Posts: 1,171

Bikes: '16 Spesh Diverge, '14 Spesh Fatboy, '18 Spesh Epic, '18 Spesh SL6, '21 Spesh SL7, '21 Spesh Diverge...and maybe n+1?

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 456 Post(s)
Liked 526 Times in 320 Posts
Originally Posted by cubewheels View Post
You could but you'll have to use higher air pressure than you normally would with the tire size and loaded weight over the wheel.
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.
Badger6 is offline  
Old 12-16-21, 06:22 AM
  #5  
Noonievut
Senior Member
Thread Starter
 
Join Date: Sep 2009
Posts: 791
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 222 Post(s)
Liked 118 Times in 75 Posts
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...
Noonievut is offline  
Old 12-16-21, 08:41 AM
  #6  
mstateglfr 
Sunshine
 
mstateglfr's Avatar
 
Join Date: Aug 2014
Location: Des Moines, IA
Posts: 14,273

Bikes: '18 class built steel roadbike, '19 Fairlight Secan, '88 Schwinn Premis , Black Mountain Cycles Monstercross V4, '89 Novara Trionfo

Mentioned: 115 Post(s)
Tagged: 0 Thread(s)
Quoted: 7753 Post(s)
Liked 4,736 Times in 2,732 Posts
Originally Posted by Noonievut View Post
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)?
My current wheels have Hydra rims that are 24mm external and 20mm internal. I run 43mm GK SS tires and before that ran 42mm WTB Resolute tires.
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.
mstateglfr is offline  
Old 12-16-21, 11:12 AM
  #7  
Badger6
Obsessed with Eddington
 
Badger6's Avatar
 
Join Date: Jun 2013
Location: Brussels (BE) 🇧🇪
Posts: 1,171

Bikes: '16 Spesh Diverge, '14 Spesh Fatboy, '18 Spesh Epic, '18 Spesh SL6, '21 Spesh SL7, '21 Spesh Diverge...and maybe n+1?

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 456 Post(s)
Liked 526 Times in 320 Posts
Originally Posted by mstateglfr View Post
A 19mm internal rim can handle a 43mm tire just fine.
Concur. No one posting here is riding at the edge of any performance envelope (unless I’ve severely misjudged the crowd). Put the tire on the rim, and go ride your bike!
Badger6 is offline  
Likes For Badger6:
Old 12-18-21, 12:38 AM
  #8  
Badger6
Obsessed with Eddington
 
Badger6's Avatar
 
Join Date: Jun 2013
Location: Brussels (BE) 🇧🇪
Posts: 1,171

Bikes: '16 Spesh Diverge, '14 Spesh Fatboy, '18 Spesh Epic, '18 Spesh SL6, '21 Spesh SL7, '21 Spesh Diverge...and maybe n+1?

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 456 Post(s)
Liked 526 Times in 320 Posts
Originally Posted by cubewheels View Post
Yes, the difference in inflated width is very minimal.
That’s called a distinction without a difference.

Originally Posted by cubewheels View Post
But according to experience, you should increase pressure by as much as 20% with narrower rim …
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
Badger6 is offline  
Likes For Badger6:
Old 12-18-21, 01:52 AM
  #9  
Racing Dan
Senior Member
 
Racing Dan's Avatar
 
Join Date: Aug 2015
Posts: 2,028
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 1190 Post(s)
Liked 247 Times in 164 Posts
Originally Posted by Noonievut View Post
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).
Its perfectly fine. The usual standard, ETRTO, followed by most manufacturers, allows much larger than 43mm tyre on a i19mm rim.

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.
Racing Dan is offline  
Likes For Racing Dan:
Old 12-18-21, 06:09 AM
  #10  
Badger6
Obsessed with Eddington
 
Badger6's Avatar
 
Join Date: Jun 2013
Location: Brussels (BE) 🇧🇪
Posts: 1,171

Bikes: '16 Spesh Diverge, '14 Spesh Fatboy, '18 Spesh Epic, '18 Spesh SL6, '21 Spesh SL7, '21 Spesh Diverge...and maybe n+1?

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 456 Post(s)
Liked 526 Times in 320 Posts
Originally Posted by cubewheels View Post
...40mm wide rim vs 25mm wide rim which is huge and you can absolutely feel the difference, I actually had to pump 33% more pressure on the same tire mounted on the 25mm wide rim just to get the same feel.
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.
Badger6 is offline  
Likes For Badger6:
Old 12-18-21, 08:29 AM
  #11  
cb400bill
Forum Moderator
 
cb400bill's Avatar
 
Join Date: Jul 2007
Location: Kalamazoo MI
Posts: 20,297

Bikes: Fuji SL2.1 Carbon Di2 Cannondale Synapse Alloy 4 Trek Checkpoint ALR gravel Viscount Aerospace Pro Schwinn Paramount PDG 5

Mentioned: 51 Post(s)
Tagged: 0 Thread(s)
Quoted: 2721 Post(s)
Liked 4,237 Times in 2,541 Posts
Originally Posted by Noonievut View Post
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...
Much of my riding on my Checkpoint is also on pavement and crushed limestone. Some on dirt roads. I have the GKSS in 38 on my Velocity Aileron rims and they work great for me.

__________________
Life is good






cb400bill is offline  
Likes For cb400bill:
Old 12-18-21, 10:29 PM
  #12  
tyrion
Senior Member
 
tyrion's Avatar
 
Join Date: Oct 2015
Location: San Diego, California
Posts: 3,706

Bikes: Breezer Radar

Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 1985 Post(s)
Liked 1,477 Times in 715 Posts
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.
tyrion is offline  
Likes For tyrion:
Old 12-19-21, 01:55 AM
  #13  
Badger6
Obsessed with Eddington
 
Badger6's Avatar
 
Join Date: Jun 2013
Location: Brussels (BE) 🇧🇪
Posts: 1,171

Bikes: '16 Spesh Diverge, '14 Spesh Fatboy, '18 Spesh Epic, '18 Spesh SL6, '21 Spesh SL7, '21 Spesh Diverge...and maybe n+1?

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 456 Post(s)
Liked 526 Times in 320 Posts
Originally Posted by cubewheels View Post
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.
You really want to die on that "higher pressure in a larger volume tire” hill, don’t you?
Badger6 is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.