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Emeritus Forum Staff
2015 Triumph Tiger XCx 1 Down. 5 Up.
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5,242 Posts
Discussion Starter #1
I have a set of 17" OEM wheels that I've not used yet - I was planning to keep the Geolandars on the standard rims for use in the winter months and have the 17s on in the summer.

Now that the weather is beginning to warn up, it's soon time to put some summer tyres on and I'm debating what size to fit and whether to use the 17s or stick with the stock 16s.

215/55/R17s and 225/50/R17s are closer to the OEM 215/60/R16 circumference but 225/45/R17s are considerably cheaper though a bit smaller... has anyone run 225/45/R17s?

Obviously the speedo will be further out with the 45s (can this be adjusted via the ECU - MY03?) but is there likely to be any difference in fuel economy due to the smaller size wheel (more RPM per MHP)?

The alternative is to stick with the 16" rims and go with 225/55/R16s

Thoughts, opinions, etc???
 

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2008 BMW 130i Manual
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194 Posts
I'm currently using 215/55/17 on my 07 XT and they seem fine, however i'm thinking of actually going the other way and getting some Falken's in 225/55/17 as I have heard they are very good in this size and still give good ride comfort whilst being a little wider than stock.
 
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225/45's would be too small for the speedo to be anywhere near accurate, I run 225/50 and really need to go to 225/55 to correct my speedo error of 6mph..
 

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Emeritus Forum Staff
2015 Triumph Tiger XCx 1 Down. 5 Up.
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Discussion Starter #5
225/45's would be too small for the speedo to be anywhere near accurate, I run 225/50 and really need to go to 225/55 to correct my speedo error of 6mph..
Figured this might be the case. 6mph is pretty accurate for a speedo in my book.

Was hoping to be able to go for a lower profile to sharpen up the steering - though moving off the Geolandar balloons will no doubt help (even if I were to stick to the same profile.

Have found some Yokohama Advan ST V802 for £106 each in 225/55 size - seems like a fairly good price to me... anyone know what these are like?

The new wheels I have are 7" width with a 48mm offset so I can probably get away with a 235 without rubbing but I'm not sure a 235 will go on the rims.
 

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Emeritus Forum Staff
2015 Triumph Tiger XCx 1 Down. 5 Up.
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5,242 Posts
Discussion Starter #6
you don't state what width the 17" rims are

but anyway - have a look here - and compare stock/oem with some tyre sizes of your selection and you will see whether they are likely to cause fitting issues or not and how innacurate speedo will be:

Wheel / tire size calculator / comparer - WWW.RIMSNTIRES.COM

paul w
That's a good link, thanks... apparently I might be able to get away with a 245/50/R17 though I'm not sure I fancy paying the £200 per tyre (with only two options) that appeared on Blackcircles! :icon_biggrin:
 

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2008 BMW 130i Manual
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194 Posts
I'm pretty sure that the max you can get away with is a 225 on a 17x7" rim on an SG version. I currently have 215's and even they are pretty close to the rear suspension. I understand 225's with leave about a 3mm gap.
 

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98 JDM Stb Manual
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3,787 Posts
I have used 215 / 45 but speedo was way out, had Impreza wheels, with spacers, cheap at the time, but didnt look quite right
 

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2015 Triumph Tiger XCx 1 Down. 5 Up.
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Discussion Starter #9
I'm pretty sure that the max you can get away with is a 225 on a 17x7" rim on an SG version. I currently have 215's and even they are pretty close to the rear suspension. I understand 225's with leave about a 3mm gap.
Do you know what offset that is with? Both my sets of wheels have a 48mm offset.
 
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