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**Snow** · 06-19-2003, 06:17 AM

If I'm not mistaken, the stock front tire is 100/90-19 or mm90-19 , not 110/90. I know jumping one size should be ok, but 2 sizes?

**sixtysix** · 06-19-2003, 02:53 PM

I have a 100/90-19 on mine, it should be easy to tell if the tire is rubbing.

**cuda_phish1** · 06-19-2003, 05:20 PM

tire size

I checked the tire size charts and my '79 size and it says it's a 3.5H19 which converts to 110/90 or ML90. So I only went up one size. It's raining here now so when I get the weather I'll take the fender off and ride.

**cuda_phish1** · 06-19-2003, 05:30 PM

GAH

They have 2 charts. One is a generic motorcycle size chart. The other is a Street bike tire size conversion chart. So I did go up 2 sizes.

Is it safe to have a friend machine the mount holes alittle so the fender sits taller and I'm not rubbing? Or since I have a full faring can I run without the fender?

Maybe a Custom fender? or one off another Yamaha that might work?

I also wanted to change the back tire to a larger tire. Any suggestions?

**uk1.1s** · 06-20-2003, 02:02 AM

Big Tyres

Sorry to add a little downer on your experiments - but do beware going for large tyres.

One size is usually OK but as you get larger on the same rim the rim/tyre bead interface becomes more strained and can lead to the tyre jumping off when under most stress (most stress = most speed usually - or at worst a fast corner). Saw the result after someone fitted the wrong size front tyre to a big BMW ... it wasn't nice

Why larger tyres? - Performance-wise larger tyres usually mean slower steering (all other things remaining the same) - so there is a slight detriment to the quest for that 'fat tyre' look. If you are looking for performance enchancing effects I don't think you can get big enough (on XS wheels) to make a significant difference to the rubber contact patch area on the road. Best thing for performance you could probably do is make sure that your tyres are new(ish) and of a suitable soft compound - OK I know for standard sizes the most sport oriented rubber isn't too easy to come by - but there's usually something that is grippy enough for everything you are likely to need on the road.

If is it a custom 'look' that you are after you may want to consider going the whole hog (no not one of those!). I've seen good (safe) results with a wide-glide front end machined for an XS so that a big rim / tyre combination can be put up front. On the back it's a little more tricky - but there has been talk of experimenting with a VMax back wheel. The Dutch XS1100 Club seem to have a way of dropping in XJ900 Diversion wheels - but I don't think that's an American model. Either way, it would take a fair amount of engineering to sort out.

At the end of the day - riding with a bit of 'spirit' I have managed to blast past a lot of Sunday rider sports bikes on the old XS in the corners enjoying how much it annoys them! In the UK the age of the bike is linked to one of the letters on the licence plate, so it's fairly obvious that they've just been out ridden by a bike old enough to go out on it's own!!

Take care out there

**cuda_phish1** · 06-20-2003, 08:30 AM

why the size

Well, originally I thought I was only going up ONE size. But the charts I followed for sizing were wrong and I ended up 2 sizes up.

As far as the front end mods using hog parts, probably won't. I was however lookingat a fat tube rolling chassis from Steel Thunder http://steelthundercc.com/rollingframe.html .

I have friends locally I can get drive parts from, tanks bars etc for HD's.
Would be a sweet ride. BUT, I won't get rid of my XS

Cuda_phish
A Happy Barracuda on Nitrous.

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