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PostPosted: Sun May 31, 2020 9:51 pm 
Old School Grand Master

Joined: Sun Aug 07, 2011 10:55 am
Posts: 3367
Location: Dorset
Had a 2.1 tyre on the front of my Explosif and a 1.9 on the rear.

They have worn so I have replaced with 2.1 front and rear and it feels :? The rear isn't touching the frame but it's close.

The tyres are a similar tread pattern but it feels unsettled on the rear.

Anyone had any experiences of different sizes.


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PostPosted: Tue Jun 02, 2020 7:55 pm 
MacRetro rider
MacRetro rider
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Joined: Fri Feb 09, 2007 4:16 pm
Posts: 9387
Was the previous 1.9 rear specific ?
If the new 2.1 is similar to existing front might it be front specific.
Alternatively your used to the way your weight affected the narrower tyre. A wider tyre will bulged out further over the rim thus will deform more and thus move more. Try pumping tyre to higher psi thus reducing the deformation.


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PostPosted: Tue Jun 02, 2020 8:05 pm 
Retro Guru
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Joined: Thu May 17, 2012 11:04 am
Posts: 879
Location: manchester
It's different, get used to it over time


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PostPosted: Wed Jun 03, 2020 4:23 pm 
Retro Guru
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Joined: Tue May 11, 2010 6:39 pm
Posts: 1533
Location: South Devon
I’ve been enjoying a big front small rear setup...


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PostPosted: Wed Jun 03, 2020 4:39 pm 
Retro Guru

Joined: Mon Jul 20, 2009 6:27 pm
Posts: 844
On my modern mountain bike I tend to run a 2.8-3 inch on the front and a 2.6 inch the rear. Partly a clearance issue as I find rear wheels/tyres are more likely to flex and rub than the front - probably because they get more weight over them, aren't as stiff and take more of hammering.

Extra width on front also gives better braking without feeling as draggy as both wheels with wide tyres do.


Last edited by greencat on Thu Jun 04, 2020 3:48 am, edited 2 times in total.

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PostPosted: Wed Jun 03, 2020 4:40 pm 
Retro Guru

Joined: Tue Oct 06, 2009 11:46 am
Posts: 327
Location: Holbeach
Its my preferred set up.


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PostPosted: Thu Jun 04, 2020 3:26 am 
Retro Guru
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Joined: Sat Apr 18, 2020 6:24 pm
Posts: 298
I run 2.0 on both front and rear but then again I never understood the reasoning for using different sizes. Feel free to enlighten me!


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PostPosted: Thu Jun 04, 2020 3:51 am 
Retro Guru

Joined: Mon Jul 20, 2009 6:27 pm
Posts: 844
Imlach wrote:
I run 2.0 on both front and rear but then again I never understood the reasoning for using different sizes. Feel free to enlighten me!


I see it as a half way house where you get some of the benefits of both a wider and narrower tyre on the ends of the bike where they make the most difference. The difference is likely quite marginal though and my set up is partly based on these were the cheapest tyres I could get at the time.


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PostPosted: Thu Jun 04, 2020 8:48 am 
King of the Skip Monkeys
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Joined: Wed Nov 07, 2007 4:34 pm
Posts: 32385
Location: Bournemouth's most wanted
Works for some

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PostPosted: Thu Jun 04, 2020 9:16 am 
Devout Dirtbag

Joined: Wed May 13, 2020 7:55 pm
Posts: 118
modern 29er I run 2.1" and 2.1" If i could get hold of a modern S-Works 1.9" XC tyre then I would run that on the back!

Alas narrow tyres are rocking horse poo...this is because apparently modern day mountain bikers will smash up their faces and die should they put anything under 2.3" on their biokes


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