Join Date: Sep 2018
Location: Vancouver Island, BC Canada
Mentioned: 0 Post(s)
Thought I'd chime in here as I've been trying to solve this gearing nut since I bought the bike - now 17,500 kms later I have found a solution that works for me, much like you, DennyLee, are describing.
I looked for a taller gear than 6th when I first bought the bike so I went to 15T c/s sprocket at first service (1,000 kms). That helped somewhat, but most importantly I didn't have to mess with chain length. However even after the sprocket change, i still searched for 7th gear occasionally on the highway, not knowing that I was already in 6th.
Recently, @ 17,000kms, it was time to change the rear stock tire. I installed a Shinko 705 130/90 (taller than the stock 130/80) and this has made a world of difference re gearing to my riding style. Maybe it's all in my head, but the gearing feels like it has gone from gears 1 to 6 to now more like 1.5 to 7. 6th gear now feels like overdrive and I'm bombing around town down a gear at almost any city speed - definitely using 4th and 5th a lot more.
So according to gearingcommander the combination of 15T + 130/90 rear has lowered my rpms by 10.3% and has not upset bike computer (no error code).
Plus, I have these other benefits - the bike is taller by approx 5/8", the speedo is dead-accurate, and I like the look. I also installed a set of Grip Puppies to beef up the grips and hopefully lessen grip fatigue/cramping. All in all the bike feels bigger and better.
Anyway, I'm super happy with the results of this simple change - time will tell if there is any mpg improvement - I don't really care - the bike sounds better to me - lower rpms makes me feel like I'm not constantly running the bike at a shift-point. Plus the changes might also mean that perhaps I extend the life of the chain, spockets and maybe engine since all those things are running 10% less than original.
I'm an older returning rider and I ride 99% pavement, half city, half highway. Though I will be riding some FSRs later this year.
As an aside, I measured the circumference of my stock rear tire before I changed it and it measured 1990mm, down from 2010mm spec size. According to gearingcommander, that is equivalent to 130/77 size so the warn tire is another reason for higher rpms and more inaccurate speedo. The 130/90 supposedly measures 2090mm so doing the math it equals roughly a 32mm increase in diameter which equals roughly 2/3rd" taller rear tire.
Thanks for listening.
Last edited by Pekes17; 05-11-2020 at 05:25 PM.