see the supercharged savage video posted in the cafe pause @1:24..
looks good to me

If you're going to put one on the top side, it's going to see a lot of load.
so brace accordingly.

Ladies and gentlemen, an 18T sprocket in place. Plenty of room.



With this 18T on the front and a 49T on the rear, there's about 3/16" clearance between the chain and top of the swingarm with no load on the bike.  The 49T might sacrifice too much top end, but I could probably go down to a smaller one, like 47T. I'll see how this rides first.

So Buddah,

You're going with a 49/18 which gives a ratio of 2.72 according to JT's charts.
You say that this might rob you of some Top-end speed, but it's still taller than the stock ratio of 2.957.

Most of the guys with stock wheels are doing 43/17 which gives a 2.53 ratio. This looks on paper like a pretty large change in ratio from stock; is that change really creating much faster top speeds? Without sacrificing low and mid-range acceleration?

It seems to me that if you factor in the larger rear tire on your RYCA conversion, you'd get more top end anyway, so perhaps your 49/18 ratio makes more sense for your (and mine too...) application than it would for a stock bike...

And yet RpnSht says in his build thread that he would use 45/18...
Maybe that's just him? After all, he is "RpnSht"

I'm just thinking out loud; juggling all these numbers is making my head hurt a little...

OK, I hear that!
But hurry up and get that thing on the road!
I gotta order sprockets for this beast pretty soon...

Given the standard ratio of 2.95:1, my orientation would be to fit a 45 tooth rear and a 15 tooth front to maintain the original ratio, with option to upgrade to 16 or even 17 tooth front sprockets as required.

YES!
And I'm expecting to have some clearance issues myself.
I've got 18/47t sprockets, and 13" shocks, so I'm expecting to just barely clear the swingarm, and I am NOT inclined to grind it down if I don't have to. (RipnSht ground all the way through his trying to fit 17/45 sprockets on his RYCA bike and still scarred up the top of his swingarm.) I'll be installing some sort of nylon/delrin slider pad on the top of the swingarm when the time comes. (Might be next weekend! We will see...)

49/18? Huh? Did I miss-read your older post? I thought you'd said earlier you'd go 45/18. What do you imagine the difference would be? Do you miss the low-end torque?

My buddy Jay and I got distracted by the Holidays and all that talk of Mono-shock conversion (probably a dead horse at this point, we'll see...) So nothing has happened for a while, but he's bringing the bike up to me next Thursday, and we are going to spend some quality Man-Time in my garage, so I'l be sure to post an update after all that...