Go Back  Bike Forums > Bike Forums > General Cycling Discussion
Reload this Page >

worth getting narrower tires? (currently running 40mm)

Notices
General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

worth getting narrower tires? (currently running 40mm)

Old 10-18-20, 05:33 PM
  #26  
wphamilton
Senior Member
 
wphamilton's Avatar
 
Join Date: Apr 2011
Location: Alpharetta, GA
Posts: 15,280

Bikes: Nashbar Road

Mentioned: 71 Post(s)
Tagged: 0 Thread(s)
Quoted: 2934 Post(s)
Liked 340 Times in 227 Posts
Originally Posted by TiHabanero View Post
I have been commuting on 28mm tires for decades. Never an issue with flats or durability. I also have a Miyata 1000 with 38mm tires on it that I use for commuting once in a while. The fit of the two bikes is near identical. The rack, bags, lights, pedals, and drive train are identical. The different tire size makes a slight difference in the commute time. 15 miles one way takes about 10 minutes longer on the wider tire bike. Mostly I feel the difference climbing out of the river valley, and the other hills on the route. Comes down to acceleration. When the wheels have to be pushed the narrow tires do it better. I will say, the 38mm tires have never had a flat, whereas the 28mm have had two flats in the last 4000 miles. 28mm tires are the low end Conti Ultra Sport tires, the 38mm tires are Conti City Ride tires.
I believe my road bike 28's are Ultra Sport also, and I'd say this is all on target. Maybe two flats in the last 4000 miles, out of two tires. I have 28's on my single speed commuter also. I might go up to 32's there if they would fit, but not wider.
wphamilton is offline  
Old 10-18-20, 06:01 PM
  #27  
HerrKaLeun
Senior Member
 
Join Date: Mar 2017
Location: Madison, WI
Posts: 1,923

Bikes: Giant Toughroad SLR1 and Motobecane Sturgis NX

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 900 Post(s)
Liked 229 Times in 166 Posts
Narrower tire will FEEL faster because you will bounce more at a given speed. But unless the pavement is 100% smooth, the wider tire will be faster.

Get a tire of the same size with more efficient rubber and tread. However, unless you have knobby tires, tires contribute little to effort required.
HerrKaLeun is offline  
Likes For HerrKaLeun:
Old 10-18-20, 06:10 PM
  #28  
asgelle
Senior Member
 
Join Date: Apr 2006
Location: Albuquerque, NM
Posts: 4,414
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 950 Post(s)
Liked 392 Times in 235 Posts
Originally Posted by HerrKaLeun View Post
Get a tire of the same size with more efficient rubber and tread. However, unless you have knobby tires, tires contribute little to effort required.
Rolling resistance behaves exactly the same as road slope. I can't tell where your cut off is for a little contribution but I don't think road grade and gravity are something to be ignored. From Robert Chung, "If you're a weight weenie, you should definitely also be a Crr weenie." https://marginalgainspodcast.cc/the-...-robert-chung/ https://forum.slowtwitch.com/forum/S...hung_P7086944/
asgelle is offline  
Old 10-18-20, 06:25 PM
  #29  
HerrKaLeun
Senior Member
 
Join Date: Mar 2017
Location: Madison, WI
Posts: 1,923

Bikes: Giant Toughroad SLR1 and Motobecane Sturgis NX

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 900 Post(s)
Liked 229 Times in 166 Posts
Originally Posted by asgelle View Post
Rolling resistance behaves exactly the same as road slope. I can't tell where your cut off is for a little contribution but I don't think road grade and gravity are something to be ignored. From Robert Chung, "If you're a weight weenie, you should definitely also be a Crr weenie." https://marginalgainspodcast.cc/the-...-robert-chung/ https://forum.slowtwitch.com/forum/S...hung_P7086944/
hah. I used to listen to marginal gains podcast. But is too racy for me. I assume OP also is just riding along.

As I said, unless you have an MTB tire, the differences in rolling resistance are small. Especially compared to aero on a hybrid. But I'm a hypocrite, I run Schwalbe Almotion with extremely low resistance. But I have 2.15 in front and 2.0 in rear. Nice comfy and rolls well over imperfect surfaces.
HerrKaLeun is offline  
Old 10-18-20, 06:44 PM
  #30  
ofajen
Cheerfully low end
 
ofajen's Avatar
 
Join Date: Jun 2020
Posts: 1,677
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 535 Post(s)
Liked 867 Times in 549 Posts
Originally Posted by HerrKaLeun View Post
Narrower tire will FEEL faster because you will bounce more at a given speed. But unless the pavement is 100% smooth, the wider tire will be faster.

Get a tire of the same size with more efficient rubber and tread. However, unless you have knobby tires, tires contribute little to effort required.
Actually, itís common to have tires require a total of 30 to 50 watts, say for road to MTB tires, and for tires of roughly similar size and construction, knobs typically add a few watts per tire.

Otto
ofajen is offline  
Old 10-18-20, 07:10 PM
  #31  
HerrKaLeun
Senior Member
 
Join Date: Mar 2017
Location: Madison, WI
Posts: 1,923

Bikes: Giant Toughroad SLR1 and Motobecane Sturgis NX

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 900 Post(s)
Liked 229 Times in 166 Posts
Originally Posted by ofajen View Post
Actually, itís common to have tires require a total of 30 to 50 watts, say for road to MTB tires, and for tires of roughly similar size and construction, knobs typically add a few watts per tire.

Otto
Read the OP. He would go from one hybrid tire to a slightly different hybrid tire. I have a 4.8" fatbike and know very well the huge rolling difference to my hybrid. But that isn't the OP question.
HerrKaLeun is offline  
Old 10-18-20, 07:11 PM
  #32  
altondavis2
Senior Member
 
Join Date: Nov 2014
Posts: 268
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Liked 15 Times in 14 Posts
Agreed, if you want more performance, pedal faster.
altondavis2 is offline  
Old 10-18-20, 07:17 PM
  #33  
asgelle
Senior Member
 
Join Date: Apr 2006
Location: Albuquerque, NM
Posts: 4,414
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 950 Post(s)
Liked 392 Times in 235 Posts
Originally Posted by altondavis2 View Post
Agreed, if you want more performance, pedal faster.
How fast one goes depends on the propulsive force provided by the rider balanced against the resistive forces from the environment. It makes no difference if you increase the former or decrease the latter. For an experienced rider, there is usually much more to be gained through reducing resistance.
asgelle is offline  
Old 10-18-20, 07:19 PM
  #34  
Gary in NJ
Senior Member
 
Join Date: Sep 2020
Location: Hilly NJ
Posts: 76

Bikes: 2020 Fuji Gran Fondo 1.3, 2015 Trek FrankenMarlin Gravel Thing

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 29 Post(s)
Liked 60 Times in 31 Posts
Originally Posted by asgelle View Post
Rolling resistance behaves exactly the same as road slope. I can't tell where your cut off is for a little contribution but I don't think road grade and gravity are something to be ignored.
No kidding. On a recent climb with a 17% grade traveling at 6.3 MPH (34/34@80rpm) 12.8 watts were needed to overcome rolling resistance, 5.6 watts for drag, and 421.3 watts for gravity. Gravity made up 95.8% of the power needed to make that climb at that (low) speed.
Gary in NJ is offline  
Old 10-18-20, 07:27 PM
  #35  
asgelle
Senior Member
 
Join Date: Apr 2006
Location: Albuquerque, NM
Posts: 4,414
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 950 Post(s)
Liked 392 Times in 235 Posts
Originally Posted by Gary in NJ View Post
No kidding. On a recent climb with a 17% grade traveling at 6.3 MPH (34/34@80rpm) 12.8 watts were needed to overcome rolling resistance, 5.6 watts for drag, and 421.3 watts for gravity. Gravity made up 95.8% of the power needed to make that climb at that (low) speed.
Iím not about to repeat what was explained so well in the podcast. Listen, donít listen; think about it or not, doesnít matter to me.
asgelle is offline  
Old 10-18-20, 07:36 PM
  #36  
gregf83 
Senior Member
 
Join Date: Jun 2008
Location: Vancouver, BC
Posts: 9,201
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 1186 Post(s)
Liked 289 Times in 177 Posts
Originally Posted by HerrKaLeun View Post
Narrower tire will FEEL faster because you will bounce more at a given speed. But unless the pavement is 100% smooth, the wider tire will be faster.

Get a tire of the same size with more efficient rubber and tread. However, unless you have knobby tires, tires contribute little to effort required.
If you're not riding on gravel 40mm Schwalbe G-One All arounds are much slower. If you're riding solo for exercise it doesn't make a difference how fast you go but if you're commuting or trying to keep up with a group some 28mm slicks would be significantly (~2mph) faster.
gregf83 is offline  
Old 10-18-20, 08:16 PM
  #37  
cxwrench
Senior Member
 
cxwrench's Avatar
 
Join Date: Jul 2013
Location: Nor-Cal
Posts: 3,767

Bikes: lots

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 1954 Post(s)
Liked 2,925 Times in 1,488 Posts
Originally Posted by cyccommute View Post
No. Bicycle tire calculators say that is right for my weight. Years of riding experience tell me that is the right pressure for my weight. Frankly, I see any thing less than that to be far too low. Iíve never had problems with pinch flats nor with rim damage. Iíve ridden on tires that are going flat and could never stand the wallowing feel that goes along with flat tires.
No. If you need 40psi to avoid pinch flats you need bigger tires. Or tubeless. I barely run half that in 33mm cx tires. 40psi in ANY mtb tire is crazy. If it's bigger than 2.1 or 2.2" it's ridiculous.
cxwrench is offline  
Likes For cxwrench:
Old 10-18-20, 10:16 PM
  #38  
gorillimo
Full Member
 
Join Date: Jan 2015
Location: San Luis Obispo, Ca
Posts: 370

Bikes: Cannondale Super V carbon, RockHopper Comp. Klein Quantum

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 99 Post(s)
Liked 168 Times in 84 Posts
Ridden Colnago on sew ups. Everything in between. Currently on a Cross Check with 42c Conti Speedrides. Rolls as well as anything Iíve had, and rides incredibly well. I run them a little soft. Just go by feeling. Never going back!
gorillimo is offline  
Old 10-18-20, 10:31 PM
  #39  
cyccommute 
Mad bike riding scientist
 
cyccommute's Avatar
 
Join Date: Nov 2004
Location: Denver, CO
Posts: 26,065

Bikes: Some silver ones, a red one, a black and orange one, and a few titanium ones

Mentioned: 141 Post(s)
Tagged: 1 Thread(s)
Quoted: 5405 Post(s)
Liked 2,993 Times in 1,758 Posts
Originally Posted by cxwrench View Post
No. If you need 40psi to avoid pinch flats you need bigger tires. Or tubeless. I barely run half that in 33mm cx tires. 40psi in ANY mtb tire is crazy. If it's bigger than 2.1 or 2.2" it's ridiculous.
I donít agree. Less than 40 psi for my weight with 2.1Ē tires will result in not only pinch flats...an annoyance...but also damage to the rims when the rim bottoms out which is a much worse problem. Tubeless doesnít solve that problem, it just takes away the symptoms of the problem. Iíve seen many expensive wheels that have been ruined from people running essentially flat tubeless tires.

And, as I said above, tires run at 20 psi feel like flat tires to me. Iíve ridden on tires that are going flat and hate how they feel on corners. It feels like the tire is folding off the rim which it is. Iíve been running this pressure for most of 4 decades without issues. I donít experience pinch flats because I donít ride flat tires. I donít bend rims because I donít ride flat tires. I ride off road just fine with the pressure I use.
__________________
Stuart Black
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Days of Wineless Roads. Bed and Breakfasting along the KATY
Twisting Down the Alley. Misadventures in tornado alley.
cyccommute is offline  
Old 10-19-20, 12:47 AM
  #40  
Sembikes
Sembikes
 
Join Date: Oct 2020
Location: Shenzhen
Posts: 13

Bikes: AM/XC

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
it depends on road conditions or deep sections wheels...
Sembikes is offline  
Old 10-19-20, 02:07 AM
  #41  
Germany_chris
Iím a little Surly
 
Germany_chris's Avatar
 
Join Date: Jan 2010
Location: Southern Germany
Posts: 2,198

Bikes: Two Cross Checks and a Karate Monkey

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 598 Post(s)
Liked 1,091 Times in 558 Posts
Think quality not width..
Germany_chris is offline  
Likes For Germany_chris:
Old 10-19-20, 10:01 AM
  #42  
ofajen
Cheerfully low end
 
ofajen's Avatar
 
Join Date: Jun 2020
Posts: 1,677
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 535 Post(s)
Liked 867 Times in 549 Posts
Originally Posted by gorillimo View Post
Ridden Colnago on sew ups. Everything in between. Currently on a Cross Check with 42c Conti Speedrides. Rolls as well as anything Iíve had, and rides incredibly well. I run them a little soft. Just go by feeling. Never going back!
The Speed Rides are a very good choice. If I had a Cross Check running 40/16 SS with those Speed Rides and my usual touring/swept bars, that would be my only bike. 👍

Otto

Last edited by ofajen; 10-19-20 at 10:32 AM.
ofajen is offline  
Old 10-19-20, 10:32 AM
  #43  
cxwrench
Senior Member
 
cxwrench's Avatar
 
Join Date: Jul 2013
Location: Nor-Cal
Posts: 3,767

Bikes: lots

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 1954 Post(s)
Liked 2,925 Times in 1,488 Posts
Originally Posted by Sembikes View Post
it depends on road conditions or deep sections wheels...
What are you talking about? Explain...
cxwrench is offline  
Old 10-19-20, 10:40 AM
  #44  
ofajen
Cheerfully low end
 
ofajen's Avatar
 
Join Date: Jun 2020
Posts: 1,677
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 535 Post(s)
Liked 867 Times in 549 Posts
Originally Posted by cxwrench View Post
40psi on a mountain bike?!? How do you stay upright? That's crazy high.
Itís really going to vary based on total weight, tire size and construction, riding surface and so on.

With a total weight of 200 lbs, I run almost 40 psi on the rear with a 26x2.0 Contact Speed on road and dry crushed stone trails, but more like 32 front 34 rear on 26x2.2 Race Kings on gravel and slightly soft trails. If it were messy, Iíd be running lower. YMMV.

Otto
ofajen is offline  
Old 10-19-20, 11:15 AM
  #45  
gorillimo
Full Member
 
Join Date: Jan 2015
Location: San Luis Obispo, Ca
Posts: 370

Bikes: Cannondale Super V carbon, RockHopper Comp. Klein Quantum

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 99 Post(s)
Liked 168 Times in 84 Posts
Originally Posted by ofajen View Post
The Speed Rides are a very good choice. If I had a Cross Check running 40/16 SS with those Speed Rides and my usual touring/swept bars, that would be my only bike. 👍

Otto
This one *is* my only bike.....

Last edited by gorillimo; 10-19-20 at 03:57 PM.
gorillimo is offline  
Old 10-19-20, 12:29 PM
  #46  
msu2001la
Senior Member
 
msu2001la's Avatar
 
Join Date: Mar 2006
Location: Midwest
Posts: 2,431
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 1203 Post(s)
Liked 1,198 Times in 706 Posts
I'm 165lbs. I run the following:
33mm CX tubulars are usually around 20psi for racing.
33mm - 35mm clinchers are usually around 30-45psi for training and gravel
32mm tubeless road tires are 50psi

When I used to run 28mm clincher road tires, I'd air them up to around 65-70psi. I didn't notice any difference in speed between 28mm and 32mm. I do notice a pretty big difference in speed (on pavement) between 32mm road tires and 35mm gravel tires.
msu2001la is offline  
Old 10-19-20, 06:45 PM
  #47  
ofajen
Cheerfully low end
 
ofajen's Avatar
 
Join Date: Jun 2020
Posts: 1,677
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 535 Post(s)
Liked 867 Times in 549 Posts
Originally Posted by gorillimo View Post
This one *is* my only bike.....
Actually I have a basically similar bike with touring bars and 42/16 SS built from a vintage MTB and running 26x2.0 or 2.2. The only benefit to switching would be more selection of tires.

Itís mainly for nostalgia that I keep a 700x32 roadish bike built up: it gives me a use for nice caliper brakes, road cranks, etc that I bought long years ago. Of course that bike is also a few pounds lighter and typically at least 1/2 mph faster, at least on routes Iím willing to ride a ďskinny tireĒ bike.

Otto
ofajen is offline  
Likes For ofajen:
Old 10-19-20, 07:51 PM
  #48  
gorillimo
Full Member
 
Join Date: Jan 2015
Location: San Luis Obispo, Ca
Posts: 370

Bikes: Cannondale Super V carbon, RockHopper Comp. Klein Quantum

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 99 Post(s)
Liked 168 Times in 84 Posts
Originally Posted by ofajen View Post
Itís mainly for nostalgia that I keep a 700x32 roadish bike built up:
Otto
Id been leaning towards more versatile bikes. A Grant Peterson fanboy. Was about to hit the button on a demo Riv. The next day the CC came up local. Very similar, but 1/3 the price. Goes anywhere, does anything. Trails. Road. Errands. Just for fun. A half century. A really good bike!
gorillimo is offline  
Old 10-20-20, 06:55 AM
  #49  
ofajen
Cheerfully low end
 
ofajen's Avatar
 
Join Date: Jun 2020
Posts: 1,677
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 535 Post(s)
Liked 867 Times in 549 Posts
Originally Posted by gorillimo View Post
Id been leaning towards more versatile bikes. A Grant Peterson fanboy. Was about to hit the button on a demo Riv. The next day the CC came up local. Very similar, but 1/3 the price. Goes anywhere, does anything. Trails. Road. Errands. Just for fun. A half century. A really good bike!
I really like that one. What kind of bars are you running?

The guy who sold me the RockHopper MTB frame a few years back runs one of our local bike shops. A year ago he was selling his CC frame and wheels to go with it, if needed. But it was a 23Ē frame and Iím tall enough to really want something around 25Ē in 700C.

If I do buy another frame, it will be something about like that, to run Speed Rides in that size. About the only new parts I would need other than whatís on the Schwinn would be brakes. That would be a little sad, as Iíve run the Superbe brakes for over forty years and they are probably good for at least another forty.

Otto
ofajen is offline  
Old 10-20-20, 07:12 AM
  #50  
gorillimo
Full Member
 
Join Date: Jan 2015
Location: San Luis Obispo, Ca
Posts: 370

Bikes: Cannondale Super V carbon, RockHopper Comp. Klein Quantum

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 99 Post(s)
Liked 168 Times in 84 Posts
Originally Posted by ofajen View Post
I really like that one. What kind of bars are you running?
Otto
The bars are Noirette plus, from Amazon.
Pretty funny. The bike previous to this was a modded Rockhopper!
gorillimo is offline  
Likes For gorillimo:

Thread Tools
Search this Thread

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

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.