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 Post subject: What size MT21?
PostPosted: Tue Jan 31, 2017 6:15 pm 
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80 cc

Joined: Sat Jan 09, 2016 6:46 pm
Posts: 80
Location: Gloucestershire
I think I'm going to go for a MT21's on the DR but not sure on the sizing? The manual says 110/90 but Pirelli only offer the 110/80, 120/90 or 130/90? Currently have a pair of Michelin AC10's the rear is 110/100, any advice appreciated.


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 Post subject: Re: What size MT21?
PostPosted: Tue Jan 31, 2017 6:42 pm 
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300 cc
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Joined: Mon Apr 22, 2013 7:07 pm
Posts: 570
All AC 10s are oversized. E.g. A 110 is more like a 120 and a 120 is more like a 140. This is because the knobbles are a lot taller as they are mx tyres.

I always ran a 120 rear MT21 on my DR350 and seem to recall a 140 is way to wide and rubbed.

A 110/100 with its taller side wall will squash out more and give a similar foot print to a 120/80 that's not so squashed. If you follow my drift.

FYI. The 110 or 120 refers to the width in mm. and the /80 /90 refers to the height of the side as a percentage of the width.

So a 110/100 is 110 wide and 110 tall. A 120/80 is 120mm wide but only 96mm tall.

Don't get too hung up on tyre size. 10mm in the width won't make a lot of difference. But unless it's snow your riding in, the wider is better.


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 Post subject: Re: What size MT21?
PostPosted: Tue Jan 31, 2017 11:07 pm 
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80 cc

Joined: Sat Jan 09, 2016 6:46 pm
Posts: 80
Location: Gloucestershire
When you had your DR did you still run the chain guard? I like to keep it on so I wonder if a 120 might be too wide and will rub?


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 Post subject: Re: What size MT21?
PostPosted: Tue Jan 31, 2017 11:16 pm 
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300 cc
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Posts: 570
Funny story that, no I didn't but I'm sure the 120 clears!

I ended up with 6 plastic chain guards in the garage after years of DR ownership. I put them all on ebay and each one made between about £45-£50. kerching!


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 Post subject: Re: What size MT21?
PostPosted: Sun Feb 05, 2017 9:26 pm 
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125cc

Joined: Wed Jan 06, 2010 9:49 pm
Posts: 160
A 120/90x18 will fit nicely on a DR350 if that's the bike you've got. I've used DR350 's for 23 years and used MT21's for a good while.


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 Post subject: Re: What size MT21?
PostPosted: Mon Feb 06, 2017 3:59 pm 
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125cc

Joined: Mon Apr 13, 2009 5:11 pm
Posts: 226
Location: Bradford
Has anyone got any recommended suppliers for MT21s, my usual supplier closed last year so resorted to eBay for the last one, but gonna need another one soon for my TTR600

Richard

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 Post subject: Re: What size MT21?
PostPosted: Mon Feb 06, 2017 9:55 pm 
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80 cc

Joined: Sat Jan 09, 2016 6:46 pm
Posts: 80
Location: Gloucestershire
They seem very pricey on bay of e, my local supplier Chris Mullins tyres is cheaper and you get top notch service,


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