Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Mountain Biking Mountain biking is one of the fastest growing sports in the world. Check out this forum to discuss the latest tips, tricks, gear and equipment in the world of mountain biking.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 10-18-02, 07:55 AM   #1
Funnyman
Junior Member
Thread Starter
 
Join Date: Sep 2002
Location: Norfolk, VA
Bikes:
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Slicks VS Knobby tires

I was in a local bike shop looking at some slicks for a century in December. A couple of the hourlies there say going from an average set of knobby tires to a set of 150psi slicks will add 3 to 4 miles per hour to my speed. Sounds a little to good to be true. Anyone out there had experience doing a century with similar equipment. ie. A moutain bike with slicks. I am doing about 60 miles a week at 14.7 to 15.7mph now.
Thanks
Funnyman is offline   Reply With Quote
Old 10-18-02, 08:26 AM   #2
The Toninator
Senior Member
 
Join Date: Aug 2001
Location: Houston
Bikes:
Posts: 495
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
well there's two different things going on here. You have road tire slicks and mountain bike tire slicks. IF you get the road slicks it will require you to have different sized rims and depend on what kind of break set up you have they probably wont work but that will add extra MPH to you overall total.
Mtb slicks on an mtb rim will also add extra MPH to your overall but not as much as the road/road set up.
I did an MS 150 (houston to austin 182 miles) two years ago on a mtb with slicks/mtb rim and it was coush.
So in summation:

Yes it will add extra MPH to your totall but how much will depend on your setup.
t
The Toninator is offline   Reply With Quote
Old 10-18-02, 11:20 AM   #3
MichaelW
Senior Member
 
Join Date: Feb 2001
Location: England
Bikes:
Posts: 12,932
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Going from knobblies to slicks is the single biggest improvement you can make for riding on the road.
Knobbles are like small bumps that suck your energy and turn it into noise.
Slicks are narrower, so can take a higher pressure which reduces rolling resistance.

The width thing is a bit more complex. At the same pressure a wider slick has a lower rolling resistance, BUT narrower tyres can generally take higher pressures.
For distance riding, a slick of 1.25 to 1.5", pumped to its max will be effective.

My touring partner had fat knobblies. When one burst, I convinced her to change to slicks and she was amazed at the difference, and was still able to use them on trails.
MichaelW is offline   Reply With Quote
Old 10-18-02, 11:45 AM   #4
Styk33
Senior Member
 
Join Date: Oct 2002
Location: Fair Oaks, CA USA
Bikes: 96' DeRose SLX, '04 Cervelo P2K, ~'80 Schwin converted to fixie, '04 Jamis Nova
Posts: 205
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I will tell you that I averaged 2MPH faster from one day to the next. Going from knobbies to slicks on my morning training rides. There was no question on how much nicer it was to be on some nice tires. I could just coast down most hills that I was having to pedal down to maintain my speed.

Now if they are saying you could gain 3-4mph going from a mtb to a road bike, I would almost have to agree. That is about what happened to me when I switched. I picked up almost 2mph on my rides going from my MTB (with slicks) to my current road bike (Jamis Nova with slicks).
__________________
Reverend Dr. Jay
MySpace
Styk33 is offline   Reply With Quote
Old 10-18-02, 06:59 PM   #5
Chris L
Every lane is a bike lane
 
Chris L's Avatar
 
Join Date: Apr 2000
Location: Gold Coast, Queensland, Australia - passionfruit capital of the universe!
Bikes:
Posts: 9,626
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Going to slicks added a couple of km to my average speed and increased my endurance.
__________________
"I am never going to flirt with idleness again" - Roy Keane
"We invite everyone to question the entire culture we take for granted." - Manic Street Preachers.
My blog.
My bike tours. Japan tour page under construction.
Chris L is offline   Reply With Quote
Old 10-21-02, 04:08 AM   #6
bikerider
Senior Member
 
bikerider's Avatar
 
Join Date: Sep 2001
Location: Toronto, Canada
Bikes:
Posts: 376
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally posted by Funnyman
I was in a local bike shop looking at some slicks for a century in December. A couple of the hourlies there say going from an average set of knobby tires to a set of 150psi slicks will add 3 to 4 miles per hour to my speed. Sounds a little to good to be true. Anyone out there had experience doing a century with similar equipment. ie. A moutain bike with slicks. I am doing about 60 miles a week at 14.7 to 15.7mph now.
Thanks
Going to narrow slicks from fairly wide knobbies will make a considerable difference, though I think 3-4 mph is a bit optimistic.

I don't know of any 26" slicks which are suited to such high pressures. 100 p.s.i. is about the limit for the 1.0 and 1.25 x 26" slicks I have seen/used (I use the Specialized Fat Boys, 26 x 1.25").

If your rims are fairly wide, you will probably be best served with a 1.5" tire. If you can use 1.25, this will be even better for your avg speed though with the greater pressure necessary with narrower tires the ride comfort will decrease.

The best reason to use slicks is for increased traction, something you will especially appreciate going around corners at high speed.
bikerider is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 02:32 PM.