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Anyone Running a 2.53 rear drive on their R11S?

This recent R11S that came to the shop about five weeks ago is turning into a interesting project of advance farkle and high top end due to a slick full length pan and removal of extras from the rear end of the bike. I am in the process of installing a 2.53 rear drive on it and was wondering if anyone out there is running one of these on their bike for long distance slab runs, better mileage, or less vibration at freeway speeds. Anyone running one of these? Curious as to how it launches with such tall overall.
Old 03-17-2013, 02:24 PM
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so you zing it up and slip the clutch, like an old yamaha roadracer. looking forward to riding with you again, I have learned that old age and hard knocks tend to slow down a rider
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Old 03-17-2013, 05:28 PM
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What is the 2.53 rear drive from...?
Interested to see how this goes, would be good to lower the rpm a little at cruz speeds, 70mph, 80mph, which would keep it under the 4k rpm vib level...

Jeremy
Old 03-18-2013, 02:22 AM
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Jeremy, the 2.53 ratio is taken from the Cruiser units. The standard R11S is a 2.75.
Old 03-18-2013, 05:48 AM
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That's just weird! I've always geared all my chained bikes shorter not taller! I find the gearing on the R1100S just perfect, I would not want it taller by any means tho. If anything, I'd like a shorter 1-3 gear, the rest is just fine.

Just think about acceleration and drivability you will be robbing away. On my RC51, I went 15/42 vs. the 16/40 stock. The bike now redlines in 6th at 155 mph, so I lose well over 20 miles/hour BUT from 0-155 there are no flat spots, drivability is vastly improved, and the bike is just plain more fun to ride.

Speaking of which, I went to bike week and rode a Harley Dyna Fat Bob and a Softail, speaking of tall-geared bikes!!! Gee, who needs a theoretical 170+ miles/hour on a cruiser! You can't even use the 6th gear unless you are going well over 90 miles/hour, and trust me anything over 80 on a cruiser is worse than a colonoscopy! The Softali by the way had very limited ground clearance and it did not brake for crap. The Dyna was actually a big surprise as it handled well and the brakes were adequate.
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Old 03-18-2013, 07:19 AM
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Why don't one of you Mensa members figure out what the difference would be?
Old 03-18-2013, 08:08 AM
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Assuming a 180/50 tire, and a redline @ 8500 RPM, the gain with the taller gear is about 19 miles/hour to the top speed which due to aerodynamic drag and the engine power, I doubt one can actually see.

@ 6000 rpm, the taller gear (2.53) will go about 13.75 miles/hour faster.

Again, I'm of the opinion that with the tall gear the bike will ride like crap!
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Last edited by Nitro; 03-18-2013 at 08:44 AM..
Old 03-18-2013, 08:42 AM
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Dr. Curve,

You will be altering your gearing by 8% so your reduction in rpm for a given speed would be 8%. A cruise rpm of 4000 with stock gearing will be reduced to 3680 with the altered rear. A cruise rpm of 4500 with stock gearing will be reduced to 4140 with the altered rear, and so on.

Personally I always thought the R1100S felt a bit soft in first gear so you could expect it to be even more so with the altered gearing, which might be somewhat aggravating in hill country but of course less so on the slab.

My hunch is that the R1100S has insufficient power to realize any gain in top speed.
Old 03-18-2013, 05:10 PM
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Uh, I don't think he's in search of more top speed or better perforamnce in the twisty bits...just a better cruising engine speed on the superslabs. Ya know, for those long distance jaunts? And if you can get the parts and have the ability to install yourself...why the hell not? And with the price of petrol now, again I say...why the hell not?
Old 03-18-2013, 07:44 PM
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Well sounds good to me, Im very keen to see how this goes, maybe Im looking for a 1200C or something to wreck, lol...
8% Taller gearing doesn't seem much, but maybe make a fair difference...

Thanks for your answer to... Jeremy
Old 03-19-2013, 03:12 AM
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See that JIm? pelicans aren't all naysayers.. They have good math skills..
Old 03-19-2013, 03:22 AM
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Quote:
Originally Posted by SeabeckS View Post
Uh, I don't think he's in search of more top speed or better perforamnce in the twisty bits...just a better cruising engine speed on the superslabs. Ya know, for those long distance jaunts? And if you can get the parts and have the ability to install yourself...why the hell not? And with the price of petrol now, again I say...why the hell not?


Ha... Curve is all about top speed. read post 24 for a bit of history on the man.

Fuel pressure mod
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Old 03-19-2013, 05:18 AM
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True that!
Old 03-19-2013, 08:01 AM
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Stumbled across this while looking for other stuff I've been running such for a while now assuming you have a motor with all the bells and whistles on to pull the gear takes the bike to another level if you use your S for travelling on.

The link on post 12 made me smile
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Old 09-05-2017, 07:24 AM
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