combat41 Posted May 13, 2015 Share Posted May 13, 2015 Can anyone help I have an xs 250 project under way and I want to know will a Dunlop 4.00-18 tyre fit onto the front wheel ?? I currently have an Avon Road Rider 100/90-18 on the front the wheel is a 1.85-18, I have been told that a 4.00-18 you cannot get un yet I have seen a few bikes with these sizes tyres on with the same wheels, I think the guy in the garage where I purchased the Avon from just wanted the sale and doesn't know the meaning of customer service, I was charged £90 for the Avon and since seen it on line a lot, lot cheaper, The tyre I am thinking of is a Dunlop 4.00-18 does anyone know if this will fit ???? Link to comment Share on other sites More sharing options...
Moderator drewpy Posted May 13, 2015 Moderator Share Posted May 13, 2015 I'd have a look at this chart. http://dropbears.com/u/utilities/tyrerim.htm you don't want to ride the tyre off the rim. If you have spoked wheels then you can get a wider rim on Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted May 14, 2015 Moderator Share Posted May 14, 2015 What's the standard spec sized tyre? A 4.00 will be about the same width as a 100 but because the 100 has a 90 profile the 4.00 may have a bigger tyre wall. 4.00 means 4 inches across and probably a 4 inch tyre wall. 100/90 means 100mm across and 90% of the 100mm tyre wall. Imperial and metric tyres are measured at different parts of the tyre so it is not as straight forward as it seems. Link to comment Share on other sites More sharing options...
combat41 Posted May 15, 2015 Author Share Posted May 15, 2015 Dirty DT, so do you think a 4.00-18 would fit on the front without the tyre touching the forks ?? Link to comment Share on other sites More sharing options...
Moderator drewpy Posted May 17, 2015 Moderator Share Posted May 17, 2015 its the mudguards that may touch. a 120 on the rear is max without the chainguard and 1mm from the drive chain Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted May 18, 2015 Moderator Share Posted May 18, 2015 I have to agree with Drewps on this. The tyre is at the top end of the rim range but the tyre shape will be different. Drewps is out XS expert. Link to comment Share on other sites More sharing options...
fabiostar Posted May 19, 2015 Share Posted May 19, 2015 is that not a tad big for a front? Link to comment Share on other sites More sharing options...
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