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Discussion Starter · #1 ·
The stock sizes for the YZF R125 are:

Front tyre size 100/80-17
Rear tyre size
130/70-17



However, it is known that you are able to fit 110 front, and 140 rear on with no issues.
And with the use of spacers (on the sprockets), you are able to fit 150 rear tires.
However, I cannot make any promises as to how this will affect your performance.
 

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Unless maybe with a 182 kit I could see the point but our bike already has oversize tyres for its size which Yamaha have done mostly for bigger bike look. We do not need a 130mm rear tyre with our little bike. Also would it not slow the bike putting bigger tyres on?

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Discussion Starter · #3 ·
Probably...

BUT, if you really wanted, you could.
For example... bigger tires = more options = some pretty slick sporty tires ^^

Anyway, purpose of this thread is because when I just googled the tire sizes (as I need to order a new rear tire...).
Our site didn't come up ;)
 

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Probably...

BUT, if you really wanted, you could.
For example... bigger tires = more options = some pretty slick sporty tires ^^

Anyway, purpose of this thread is because when I just googled the tire sizes (as I need to order a new rear tire...).
Our site didn't come up ;)
Aha i see what you did there... some indexing work for the old google. I dunno about you but i actually found it hard to find our right size tyres online to actually order so did it through my dealer.
 

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Just got quoted £190 for a set fitted if I just take the wheels in. (sport demons of course xD)
 

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Discussion Starter · #6 ·
Ouch.

If you shop around, you should be able to get cheaper....
 

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yea i got quoted £200 to ride in and get them fitted...
i did alot of shopping around and atm they are all around£190 to 200 mark!!!
when i checked in the summer they was 160 fitted:(
 

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Well the others I called wanted £230+ and they're further away.

Gweglez Thanks Ill see where im up too once the mopeds sold.

Thanks for the advice xD
 

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140/70 and 110/80 looks ridiculous, but there really aren't any 140/60, 110/70 options.
 

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You dont need a 140/60. 140/70 will do
 

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Discussion Starter · #13 ·
I spoke to a (trust worthy) garage the other day when I had new tyres fitted...
And the guy in there had a VERY valid point:

If you put wider tyres on our rims, which aren't designed for those tyres, then the tyre has to be forced inwards at the base, which affects the profile, and in turn actually gives you LESS contact area.

I will try and explain with a diagram, as it is kind of confusing:
(you can see the result of this effect illustrated with the black circles)

tyres.jpg
 
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Is the same with bicycles as most people do not realise the width of a rim makes a lot of difference. We always get people wanting to put really skinny tyres on bikes with rims to wide and never understand when I tell them the effect on the shape of the tyre. That is a really useful diagram/picture you found I may actually use it at work. I wonder if there is a pic like that with the reverse.

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Discussion Starter · #15 ·
Is the same with bicycles as most people do not realise the width of a rim makes a lot of difference. We always get people wanting to put really skinny tyres on bikes with rims to wide and never understand when I tell them the effect on the shape of the tyre. That is a really useful diagram/picture you found I may actually use it at work. I wonder if there is a pic like that with the reverse.

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Huh?
I made it.
I didn't 'find' it ><
 
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Discussion Starter · #16 ·
Kind of like this....
tyres2.jpg
 

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Discussion Starter · #17 ·
Here is one I found:

 

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You dont need a 140/60. 140/70 will do
the profile is too much. i'll look into a 150/60 before i go back to 130 or use a 140 again. the sidewalls looks ridiculous and the bike sits noticeably higher up, too.
 

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On a similar note... Has anyone tried stretching an undersized tyre?
What happens if you put a 120 on?
 
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