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Wrong size tyres,

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AndyNUFC
Borekit Bruiser



Joined: 14 Nov 2014
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PostPosted: 22:49 - 23 Nov 2014    Post subject: Wrong size tyres, Reply with quote
hi guys,

just re thought of this, when i first bought my bike (private) when i got it home id all ready got a user manual for it, went over the bike (basics brake fluid oil tyres)

anyway noticed immediately the previous owner had the wrong tyres on,

for the front he had 120/60's
but actually needed 120/70's

and back he had 160/50
but needed 160/60

anyway got the correct sizes but im curious to know why previous owner did this?

just a tool? Rolling Eyes

what are the "effects" of wrong tyre size?

Andy
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Rogerborg
Pathetic little child who spits dummy out..... "C U Next Tuesday"
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Wull
Crazy Courier



Joined: 10 Apr 2014
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PostPosted: 23:15 - 23 Nov 2014    Post subject: Reply with quote
For the front the only real issue you'd have is clearance with the fender.

For the rear the 60 profile would give you a taller profile and would in theory speed up turn in speed,it would also give you more lean angle to play with.

Down side would be high speed stability as the contact patch with the road is reduced,also a downside to this could be the ability to get enough heat in to the tyres but we're talking road riding here.
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AndyNUFC
Borekit Bruiser



Joined: 14 Nov 2014
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PostPosted: 23:22 - 23 Nov 2014    Post subject: Reply with quote
Wull wrote:
For the front the only real issue you'd have is clearance with the fender.

For the rear the 60 profile would give you a taller profile and would in theory speed up turn in speed,it would also give you more lean angle to play with.

Down side would be high speed stability as the contact patch with the road is reduced,also a downside to this could be the ability to get enough heat in to the tyres but we're talking road riding here.


Would that maybe explain the slight wobble on the handlebars when taking it home, after tyres changed it was ok
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Rogerborg
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SQL
World Chat Champion



Joined: 08 Aug 2012
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PostPosted: 23:28 - 23 Nov 2014    Post subject: Reply with quote
AndyNUFC wrote:
Wull wrote:
For the front the only real issue you'd have is clearance with the fender.

For the rear the 60 profile would give you a taller profile and would in theory speed up turn in speed,it would also give you more lean angle to play with.

Down side would be high speed stability as the contact patch with the road is reduced,also a downside to this could be the ability to get enough heat in to the tyres but we're talking road riding here.


Would that maybe explain the slight wobble on the handlebars when taking it home, after tyres changed it was ok


cupped tyres does this
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AndyNUFC
Borekit Bruiser



Joined: 14 Nov 2014
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PostPosted: 23:29 - 23 Nov 2014    Post subject: Reply with quote
SQL wrote:


cupped tyres does this


cupped?

apologies, new word for me haha
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Rogerborg
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iooi
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Joined: 14 Jan 2007
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PostPosted: 09:43 - 24 Nov 2014    Post subject: Reply with quote
Look here



https://www.tacomaworld.com/forum/tirecalc/imagestats/160x50xR17-160x60xR17.png



Was the previous owner a bit on the short side?
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AndyNUFC
Borekit Bruiser



Joined: 14 Nov 2014
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PostPosted: 10:06 - 24 Nov 2014    Post subject: Reply with quote
iooi wrote:
Look here



https://www.tacomaworld.com/forum/tirecalc/imagestats/160x50xR17-160x60xR17.png



Was the previous owner a bit on the short side?


nah he was about my height

5-9 maybe 5-10
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Rogerborg
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Copycat73
World Chat Champion



Joined: 11 Jan 2013
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PostPosted: 10:17 - 24 Nov 2014    Post subject: Reply with quote
likely the tire fitted was cheaper..
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CaNsA
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Joined: 02 Jan 2008
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PostPosted: 10:34 - 24 Nov 2014    Post subject: Re: Wrong size tyres, Reply with quote
AndyNUFC wrote:
for the front he had 120/60's
but actually needed 120/70's

and back he had 160/50
but needed 160/60


Wull wrote:
For the front the only real issue you'd have is clearance with the fender.

For the rear the 60 profile would give you a taller profile and would in theory speed up turn in speed,it would also give you more lean angle to play with.


It would be an issue if it needed a 60 but had a 70 on the front.

The turn in would be slower using the 60 on the front, when compared to a 70.
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Wull
Crazy Courier



Joined: 10 Apr 2014
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PostPosted: 11:38 - 24 Nov 2014    Post subject: Reply with quote
Missed the first part,I thought it needed a 60.

Anyway same principle as the rear,the secondary number is the aspect ratio. It's the percentage of the width so in this case the front will be 70% of 120mm which gives you the height.

So the height will be 84mm.

With the 60 profile fitted it will have been 72mm
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Wull
Crazy Courier



Joined: 10 Apr 2014
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PostPosted: 11:39 - 24 Nov 2014    Post subject: Reply with quote
Missed the first part,I thought it needed a 60.

Anyway same principle as the rear,the secondary number is the aspect ratio. It's the percentage of the width so in this case the front will be 70% of 120mm which gives you the height.

So the height will be 84mm.

With the 60 profile fitted it will have been 72mm
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Old Thread Alert!

The last post was made 10 years, 214 days ago. Instead of replying here, would creating a new thread be more useful?
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