At my last chain replacement I put on a 16 tooth front sprocket and standard 45 tooth rear on my '01 naked. I was afraid it would make the bike really sluggish. Not so. To me it seems to make it a little more relaxed and smoother. Hey I'm 58 and trying to out drag 600SS's is not a big deal with me. I can still dust off the cruisers down here in So. GA with no problem. An indicated 70 comes at about 4500 rpm now and I'm getting an extra 20+ miles before the fuel light comes on. Nice.