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The TTR250 FAQ web pages -> TTR250 -> Sprockets, chains and gearing -> Help with gearing and tyre size
Post Info TOPIC: Help with gearing and tyre size
leigh


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Help with gearing and tyre size
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Hi Guys, 

Just bought a 2006 ttr250. cant wait to get out on it!!

 

Just changing the sprockets and tyres to make it more offroad friendly

got a question, 

 

Going to run 13-48 sprockets, got a new 110/100/18 ac10 tyre. 

Is this combo going to fit? Fitting a new chain as well. 

 

Searching the site it seems it might not fit? ie, with 110 links, chain might be too long for those sprockets, but with 108, the tyre might sit to close to the swingarm?

Anyone running this size combo?

Was going to get a 100/100 tyre but yamaha dealer was saying I should fit 110/100 as its the correct size for that model. 

Any help appreciated.

 

Cheers Leigh.

 

 

 

 

 



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ttboof


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i run the ac 10s  110/100.and recon they are great good all round .go through about 3rears to one font 

as for gearing i run 13 48.and find its good everywhere 



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leigh


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good to hear! 

 

So it fits ok then. 

 

110 chain links?



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ttboof


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No sure of the link number but it pays to keep the wheel back a bit or gets a bit close to the swing arm and shock cover . 

Also the M12,tires are very good also .a bit more full on dirt 



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leigh


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no worries, thanks for that.

soon figure it out once I start putting it together. good to know it fits before I put it all together and then find out.

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TT-R250M


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leigh wrote:

good to hear! 

 

So it fits ok then. 

 

110 chain links?

 Welcome to the forum leigh

With 13/48 it will be 108 links.

Enjoy!

Jarrah



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TT-R250M


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leigh wrote:

Was going to get a 100/100 tyre but Yamaha dealer was saying I should fit 110/100 as its the correct size for that model. 

Any help appreciated.

Cheers Leigh.

 

According to the US fiche site the wheel sizes are-

TIRE (80-100-21 D739F)

(100-100-18 59M D739)

This info is from the sevice manual-

Front: 80/100-21 51M

Rear:100/100-18 59M

The 110/100 will fit but is not what Yamaha originally used for the TTR250.

Maybe ''Yamaha'' should read the service manual more often. wink

Jarrah



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ttboof


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I got my ttrs chrissy present delivered a fresh set of AC10s 

I recon it's going to love them 

The kids can help fit them tomorrow to work of crissy lunch 1387864983199.jpg



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leigh


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Thanks for your help guys!

Just so you know all fitted up ok.

13/48. With 108 links. 110/100 fits no problem. About 20mm between tyre and plastic shock shield thingy.

Snail adjuster is on no. 8

Cheers Leigh.

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ttboof


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sounds like you nailed it .

ride on smile

 

 



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ttboof


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put my AC10s on last night .checked the chain ended up with the same settings as yours .

did 4 hours in the forest this morning and alls good smile



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