Yep, I'm attempting to buy both the 39 and the 40.......though for my Aussie 'conditions' (ie speed cameras behind every bush.....and unmarked patrol bikes.......well,..... not all the time

) the 40 will sit nicely with the extra 350 rpms putting the motor into it's smooth sweet spot (4500rpms) for the majority of Aussie road speed limits and traffic flow.
DaveNz and MrC have commented on just how quick the 'quick change' is.....so it's no drama having both available......I was also thinking

.... while out riding today.......it will be handy to have the optional sprocket on hand at tyre replacement time......not all brands of bike tyres have the same rolling diameter even though they are all labelled 190/55.......some are bigger eg Bridgestone, others are heaps smaller eg Dunlop, and I think the Michelin PR4 that I am likely to select for the rear is 'not small & not large' for it's sizing. So handy to have the other sprocket on the shelf just in case the choice of new tyre also alters the gearing.
Gawdammit......Esjot just emailed a reply advising me to contact the local agent for their sprockets...... done that already...... that's why I went to Esjot to try to get them.........grumble, mutter,
Gotta go out for a feed soon, so will try yet again.....but it isn't looking good......nothing comes up in my searches........Aussie agents (Metal Gear in Brisbane!....that's my city!)....bike too new for them to bother ordering stock..... might have to go alloy Sitta brand out of good old UK...
