PS if you go with a 46 enstead of 45 you might need a 112 link chain enstead of 110.

Yes, ordered a 112 length chain :)
But thanks for the tip anyway :)

I always ran my XT660R on a 46 tooth rear , as I loved to wheelie , but with the Tenere , I prefered the std 45 tooth rear
But as Ive always had high chain wear, im interested in the 520 vs 525 option.
I found this on the net
Quote !researched this a couple weeks ago, as I came from a drive-shaft bike, and had no idea of what these chain numbers meant.

The 5 part just describes the distance between the centers of the link pins (or wherever on the links, basically how long a link is) and the next two numbers describe the width of the chain. So a 520 chain is going to be narrower than a 525(and thus require a narrower front and rear sprocket) and lighter...this is not necessarily a good thing. Wear and durability will be affected, so you can expect your chain to not last as long, especially with the copious amount of torque that our bikes produce, all to save a few grams of rotating mass. It's up to you to decide if you can tolerate a shorter lived chain to gain performance. When I was researching it, I found other sites (the most helpful was in reference to trick riding Japanese bikes) that basically said, don't go under a 525 if you have over 1000cc--remember these guys are pretty much only doing wheelies and stuff like that, so keep that in consideration...their chains must be stronger to withstand what they do.

A 530 chain is wider still than a 525, so it is going to weigh more, last longer, etc...so far I haven't seen any even available for our bikes, so this is a mute point.

One big point to consider though is: Do you want to replace the front and rear sprockets? if not, a 520 chain is out of the question. if so...you will have to do it all at once...no incremental changes like going to a 14T front sprocket instead of stock 15T at a later date.

I run DiD gold and black X ring 525 chain and pattern steel sprockets with a good working Scottoiler.

I have just changed the chain after 11,800 miles (about 19,000km). I only changed it because I'm about to go on a 4-5000 mile trip so it was "just in case".

The chain I took off (DiD gold and black) looked like it still had plenty of life left in it, with a nice "tight" feel.

I'll keep it to refit when when the new chain is worn out.

I use a rivet link to join the chain, which I do myself - I wouldn't be that unhappy using a spring link.