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Running a wider tire up front

Old 03-16-09, 01:00 PM
  #1  
Allegro
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Running a wider tire up front

Does anyone do this? My buddy got a new bike recently and it come with 2.35 up front and a 2.1 on the rear, what is the theory behind this and does anyone reccomend it?
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Old 03-16-09, 01:20 PM
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I run a 2.35f/2.1r on my crappy bike b/c I can't fit a 2.35 between my chainstays on the rear. I would be running 2.35f/r.

The larger casing offers:
-more traction from the larger contact patch
-more traction because you can run lower pressures w/o pinch flatting
-lower pressures = cushier ride

A good reason to run wider front skinnier rear is to keep the cornering ability and still have somewhat snappy accleration.
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Old 03-16-09, 01:39 PM
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2.35's up front, 2.1's out back. I'd strongly recommend it.
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Old 03-16-09, 02:07 PM
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I hear it'll make the frame break.
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Old 03-16-09, 02:28 PM
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They also say that about putting on longer travel forks than what came with the bike
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Old 03-16-09, 03:33 PM
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Many years since I bought it- but My Kona Explosif came with a 1.95 on the front and a 1.75 on the rear.

Never did understand why but it was explained to me that the larger front tyre gave better steering at speed on hard pack trails.

I am in England so I fitted 1.8 mud tyres and chucked the OM tyres as they didn't work.
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Old 03-16-09, 03:37 PM
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just look at motocross for an example of this in the sense that the larger (diameter) front tire rolls over more crap and doesn't get stuck
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Old 03-16-09, 06:37 PM
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Originally Posted by mtnbiker66 View Post
I hear it'll make the frame break.
You heard wrong.
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Old 03-16-09, 07:55 PM
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I ran 2.7 Minion up front a 2.1 Weirwolf out back for a little while. Right now I'm running both 2.35s although there is nothing wrong with going a size up in the front. In some cases is can actually be advantages.
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Old 03-16-09, 08:21 PM
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Originally Posted by mtnbiker66 View Post
I hear it'll make the frame EXPLODE.
^
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Old 03-17-09, 05:39 AM
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Originally Posted by BearSquirrel View Post
You heard wrong.
Prove it.
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Old 03-17-09, 06:25 AM
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Originally Posted by brendon_ak View Post
just look at motocross for an example of this in the sense that the larger (diameter) front tire rolls over more crap and doesn't get stuck
Though a larger diameter tire will have a little bigger contact patch...your post would be better suited for a 69'er / 96'er conversation. The "wider" front narrower rear is more adept to frame breakage.
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Old 03-17-09, 06:43 AM
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Originally Posted by mtnbiker66 View Post
Prove it.
What are we in the freakin 3rd grade? my dad can beat your dad up...prove it...way to be mature gentleman
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Old 03-17-09, 06:45 AM
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Originally Posted by MaxxisMaster View Post
What are we in the freakin 3rd grade? my dad can beat your dad up...prove it...way to be mature gentleman
My grandson can beat up your granddaughter.
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Old 03-17-09, 08:04 AM
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Originally Posted by 10 Wheels View Post
My grandson can beat up your granddaughter.
I can beat up your grandson.
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Old 03-17-09, 09:45 AM
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Originally Posted by MaxxisMaster View Post
What are we in the freakin 3rd grade? my dad can beat your dad up...prove it...way to be mature gentleman
Why don't you just shut up. What do you know about it anyway! My Dad runs a bigger front tire that your Dad.
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Old 03-17-09, 09:57 AM
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Another reason to run a larger tire up front: it will slacken the effective head-tube angle by a fraction. If you bike is just on the edge of nervous, like mine, a bit more slack can be a Good Thing.
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Old 03-17-09, 10:01 AM
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Originally Posted by chelboed View Post
Though a larger diameter tire will have a little bigger contact patch...your post would be better suited for a 69'er / 96'er conversation. The "wider" front narrower rear is more adept to frame breakage.
I'm glad you brought this up, I am considering a 69'er SS build with my new(to me) 03 SC chameleon frame. I am thinking wider up front will def be the best bet for this setup. But it sounds like it just comes down to personal preference, I havent heard anyone say anything about making a switch and noticing much difference, but if you guys have stories like that let me know.

Thanks.
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Old 03-17-09, 10:01 AM
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I'm a BMXer, but I think the theory still applies. I always use bigger ones up front cuz they have a little bit more traction from the surface area. you want you front wheel to stick to the ground. if the rear slides, you can recover it, but if the front goes, you lose control.
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Old 03-17-09, 10:29 AM
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Originally Posted by pc_1453 View Post
I'm a BMXer, but I think the theory still applies. I always use bigger ones up front cuz they have a little bit more traction from the surface area. you want you front wheel to stick to the ground. if the rear slides, you can recover it, but if the front goes, you lose control.
That's mainly why I run a 2.3 in front and a 2.1 in back. I'll be going to a full-size 2.4 in front and smaller 2.4 in back this year [Conti Rubber Queen and Mountain King respectively].
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Old 03-17-09, 10:35 AM
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Originally Posted by pc_1453 View Post
I'm a BMXer, but I think the theory still applies. I always use bigger ones up front cuz they have a little bit more traction from the surface area. you want you front wheel to stick to the ground. if the rear slides, you can recover it, but if the front goes, you lose control.
Yeah. This was the logic for doing it way back before mtbs were suspended, you want the rear to break first.
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Old 03-18-09, 12:58 AM
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Originally Posted by TimJ View Post
Yeah. This was the logic for doing it way back before mtbs were suspended, you want the rear to break first.
FYI: that logic still applies today, with front and rear suspension.
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Old 03-18-09, 01:56 AM
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Riding around some fairly sandy/gravely, and in spots muddy trails today, I immediately regretted my decision to run 2.35 rear, 2.1 front (used to be a 2.5). Sure it rolls a bit faster, but it's a lot more slippery. Too bad the front is a Panaracer Dart (front specific tire), so I can't just swap front and back.

Last edited by kmart; 03-18-09 at 02:03 PM.
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Old 03-18-09, 01:49 PM
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What I did for my front specific tire is when I put it on the back, I just turned it around. It seems (WTB Veloraptor) to climb and have quite good traction that way.
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Old 03-18-09, 02:11 PM
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Originally Posted by ca7erham View Post
What I did for my front specific tire is when I put it on the back, I just turned it around . . . .
I turned my outside-specific rear tire inside-out on the front and now I RULE the kitchen floor.
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