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Discussion Starter #1
Does anyone know if a 6 speed GS tranny will fit on an "09" LT? I just think it needs one more gear.
 

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Aren't 4th and 5th already overdrive gears? You need to have the revs up to make it perform anyway and mid 40's to low 50's mpg aint too bad. The engines are good for 200,000 miles or more geared the way they are. Why do you feel you need the change?


Loren
 

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Discussion Starter #3
Well, the tack is showing 4k to 4.5 at 65 mph. Doesn't the GS run a little slower than that? If there were 6 gears would not the gears be a little closer and give you a more responsive bike?
I am asking just because I don't know how the trannys are geared to each bike.

I would assume the guys in the white coats at BMW know more than me but hell, it never hurts to ask.
 

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I found the gear ratios for the 1200 GS

1st gear1.583:1
2nd gear1.259:1
3rd gear1.033:1
4th gear 0.903:1
5th gear 0.903 :1
6th gear 0.805:1

K1200 LT '07 models which should be the same as the '09

1st Gear Ratio 2.05:1
2nd Gear Ratio 1.60:1
3rd Gear Ratio 1.27:1
4th Gear Ratio 0.96:1
5th Gear Ratio 0.70:1

Which means that the LT would turn lower RPM's in 5th gear while the lower 1st gear gives you the extra oomph necessary to get the big girl moving. Thiis assumes the FD ratio stays the same.

I googled: gear ration bmw gs and then gear ratio bmw k1200lt to get the info.

Loren
 

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Discussion Starter #5
Learn something new every day.

Thanks for clearing that up for me.
 

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If you never use 5th unless you are on the Interstate at 70+ it will feel more normal when you do use it.
 

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wa1200lt said:
I found the gear ratios for the 1200 GS

1st gear1.583:1
2nd gear1.259:1
3rd gear1.033:1
4th gear 0.903:1
5th gear 0.903 :1
6th gear 0.805:1

K1200 LT '07 models which should be the same as the '09

1st Gear Ratio 2.05:1
2nd Gear Ratio 1.60:1
3rd Gear Ratio 1.27:1
4th Gear Ratio 0.96:1
5th Gear Ratio 0.70:1

Which means that the LT would turn lower RPM's in 5th gear while the lower 1st gear gives you the extra oomph necessary to get the big girl moving. Thiis assumes the FD ratio stays the same.

I googled: gear ration bmw gs and then gear ratio bmw k1200lt to get the info.

Loren
That is showing both 4th and 5th gear of the GS as the same ratio. That cannot be right.

I just checked for the 2009 GS, and got these numbers:
1st 2.37:1
2nd 1.64:1
3rd 1.29:1
4th 1.06:1
5th 0.93:1
6th 0.84:1
 

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Good catch David. Duh! It's just a ......... close ratio transmission! Yea! That's it!

But the fact remains that 5th gear on the LT is still more of an overdrive than 6th gear on the GS.

I did a cut and paste from my source. Didn't check the numbers except for 1st gear and the overdrive gears.

Loren
 

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So does anyone know if the 07 and later transmission will fit the earlier LT ?

According to the numbers in the factory manual, the early LT does not have an overdrive gear.

Brett
 

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kevincaron said:
Does anyone know if a 6 speed GS tranny will fit on an "09" LT? I just think it needs one more gear.
Even if this were possible, you'd have to remember of one gotcha: you would loose the reverse! Kind of important on such a heavy bike at times...
 

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Again, all sources I could find show both 4th and 5th gears as overdrive gears.

4th : 0.96:1 - Overdrive less than 1.0:1
5th : 0.70:1 - Overdrive less than 1.0:1

I googled: bmw k1200lt 2001 transmission gear ratio.

Change 2001 to 1999 and you get the same results.

There are numerous results showing the above information.

Loren
 

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kevincaron said:
Well, the tack is showing 4k to 4.5 at 65 mph. Doesn't the GS run a little slower than that? If there were 6 gears would not the gears be a little closer and give you a more responsive bike?
I am asking just because I don't know how the trannys are geared to each bike.

I would assume the guys in the white coats at BMW know more than me but hell, it never hurts to ask.
Something seems wrong here. My 07 runs about3K @ 60 MPH and 4K @ 80 MPH. I can't believe the 09 model has gearing that is so different from the 07. Is your clutch slipping?
 

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wa1200lt said:
Again, all sources I could find show both 4th and 5th gears as overdrive gears.

4th : 0.96:1 - Overdrive less than 1.0:1
5th : 0.70:1 - Overdrive less than 1.0:1

I googled: bmw k1200lt 2001 transmission gear ratio.

Change 2001 to 1999 and you get the same results.

There are numerous results showing the above information.

Loren
Yeah, my googling shows the same thing, but the factory manual shows quite different numbers.
1st 3.864
2nd 3.022
3rd 2.393
4th 1.819
5th 1.511

They must be factoring something else in.
 

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bretta said:
Yeah, my googling shows the same thing, but the factory manual shows quite different numbers.
1st 3.864
2nd 3.022
3rd 2.393
4th 1.819
5th 1.511

They must be factoring something else in.
I suspect one set are the tranny ratios and the other are the overall drive ratio which includes the FD ratio.
 
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