BMW K bikes (Bricks)

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1Back to top Go down   K100LT gearing Empty K100LT gearing on Sun May 06, 2012 1:19 pm

JGT

JGT
Gold member
Gold member
What MPH/1000RPM should I expect to see in 5th gear?
I feel either my speedo or rev counter is out. Which should I suspect? John

    

2Back to top Go down   K100LT gearing Empty Re: K100LT gearing on Sun May 06, 2012 5:18 pm

twincarb

twincarb
Life time member
Life time member
The K has got very low down power/revs, I cant give a figure at the moment due to my K being in bits....

    

3Back to top Go down   K100LT gearing Empty Re: K100LT gearing on Sun May 06, 2012 9:19 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
An LT with a 2.91 final drive will be just north of 4100 rpm at about 100 km/h. 5000 rpm should return a smidge under 120 km/h. RS models with their 'taller' 2.81 ratio go 100+/- at 4000 rpm and should be spot on 120 km/h at 5000 rpm, both needles pointing straight up or forward.



Last edited by Guest in the House on Mon May 07, 2012 1:29 am; edited 1 time in total


__________________________________________________

"It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts."

Arthur Conan Doyle
1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - all of the Beemers in my life I can recall, owned still or sold on.
    

4Back to top Go down   K100LT gearing Empty K100LT gearing on Mon May 07, 2012 12:53 am

Rickmeister

Rickmeister
Life time member
Life time member
I've got an ex-police 1990 LT. Just did a quick shake-down ride ready for this Thursday's jaunt to Boonah and beyond.

In top gear...
3000rpm: 73Km/h
4000rpm: 95Km/h
FD ratio is stamped at 32/11

Front tyre: 40psi
Rear tyre: 44psi.

It was just a local ride, and didn't have a chance to do 5000, 6000 and 7000 rpm.

So, it seems to translate to 22Km'h / 1000rpm. Dunno what it is in mph, though. (divide by 1.6 or something like that?


__________________________________________________
Assumption is the root of all stuff-ups!
    

5Back to top Go down   K100LT gearing Empty Re: K100LT gearing on Mon May 07, 2012 1:24 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
That's a pretty accurate way to measure it, Ulrich, even listing the tyre pressures! Last year when I recalibrated my speedo using the Karamba speedo/odo calibration programme (available in the download section of this forum) I was surprised at actually how little the tyre size selected on the screen changed what was shown on the speedo. Going from a 17" rear wheel with a 140/80 tyre to an 18" wheel with a 160/60 tyre showed just a two km/h difference higher at the same rpm. It wasn't worth tearing into the speedo to adjust the teeny tiny weeny little dashpot screw to correct it.

$ince it now read$ a $midge higher at a given rpm with the lower profile tyre that'$ a $ubliminal $afety cu$hion again$t the $peed camera$ $o prevalent in our neck of the wood$. Of cour$e, we all know it'$ for our own good and that road $afety i$ paramount in their mind$ and it'$ not for the good of the $tate'$ coffer$.

:pirat:

In top gear at 1000 rpm, unloaded, my RS is spinning 22km/h, at 2000 rpm it is sitting on 53km/h and at 4000 rpm it is just kissing 101km/h, over-the-road, so there is some variance in the end result at the speedo.


__________________________________________________

"It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts."

Arthur Conan Doyle
1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - all of the Beemers in my life I can recall, owned still or sold on.
    

6Back to top Go down   K100LT gearing Empty Re: K100LT gearing on Mon May 07, 2012 11:30 am

JGT

JGT
Gold member
Gold member
Thanks for that guys, will convert to mph and check when it stops raining. john

    

7Back to top Go down   K100LT gearing Empty Re: K100LT gearing on Mon May 07, 2012 7:18 pm

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
I seem to have 4000rpm at 60mph. Its as close as I can gauge it anyway.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 103,800 miles
1983 K100RS 0011171 Fricka 606 29,495 miles Damn K Pox Its a Bat outta Hell Now 36,188  miles
    

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