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http://www.nobuyasu.net/X9/BrakeLever.html Found it, lots of interesting mods on here but for a very old bike now.

Easiest way is to buy a cheap thread pitch gauge & vernier caliper ...

https://www.ebay.co.uk/itm/Gauge-Pitch-Measure-Tool-Dual-Head-Screw-Gage-Thread-20-Blades-60-metric/173290728159?hash=item2858eeaadf:g:aZMAAOSwdFla4w3e

&

https://www.ebay.co.uk/itm/1Pc-Mini-Plastic-Ruler-Sliding-80mm-Vernier-Caliper-Gauge-Measure-Tools-UX/202318580881?epid=854085348&hash=item2f1b208c91:g:xysAAOSwaB5XpA~V

.... those will measure every nut & bolt you are likely to meet on a scooter 

I'm still plugging away with this I've found out the Aprilia SR and Piaggio NGR have the same levers.  But as with most things Italian they have soooooo many variants it's almost an impossible tasks to find which set will fit.  Trying to use the SIP Scooter Shop  https://www.sip-scootershop.com/main/base/Results.aspx? is a feat in it's self!

I'm also looking in to up grading the mater cylinder and caliper to Brembo this will give me a better system and easy choice of lever. 

The 250SL is different to the rest of the X9's that have a set of 10mm bolts into the hub so not something anyone would have known or could have gone out and measured for you.
It isn't shown on any of the parts diagrams, the early drawings were rubbish the later ones not much better.
Fowlers have a better drawing though...It states 1998-2005 which should be SL but it also says Evo but also lists other bikes from earlier period so maybe worth a try?
https://www.fowlersparts.co.uk/parts/5682394/x9-250-x9-250-evolution-chassis-number-prefix-zapm23000-1998-2005-evolution-chassis-number-prefix-zapm23000-all/rear-wheel

i had a copy on my laptop and look in the X9 service manual for the 250SL and cant find in the rear wheel section anything about wheel nut size unless i have completely missed it, i rechecked and still having problems, i found a nut in my collection that fits, its not the right one but it works for now

5 years later i still think this bike is a good one......

Sorry you lost the contract, we were away at the bash but you could have looked in the online manual

Lost the contract...couldn't fund a wheel nut.

Out if work for now.

Hi

I just stripped and shattered my wheel nut on my X9250SL i cant find the measurements for it as i need to go to shop and get one ready for work tomorow.

Can someone tell me the X9 250SL wheel nut dimensions and thread type etc etc, kinda in panic mode as got work tomorrow and 2nd work with a new courier company and i boosted how good my courier X9 bike is even when broken down i am back up again in an hour or so and then this happens so panic and nowhere does a nut for my bike .

anyone know the info i need plz

Many thanks guys

Solo can do it blindfolded at the side of the road in the dark and when it's snowing...so you should be able to do it without any problems. A holding tool is better on a 125 as it helps support the shaft from bending forces as well as stopping it turning. The Buzetti ones are cheap enough on Ebay.
Note the belt may have direction markings, the 500 ones do.