Final drives are the same but....

[bmwrich58]

.....overall length of the GS is 87" compared to 88.6" for the GSA.
Old stats use to show the "rake and trail" which were different from the GS to the GSA. They (BMW factory site) no longer list the rake n trail stats.

an explaination of "rake n trail".
http://www.jeris-springer.com/raketrail.html

 

[Shep]

Longer shocks, I would guess, equal a longer wheelbase

Shep

 

[Yoda]

Inclusion of metal panniers on the GSA ?????

 

[Steve]

Thicker tyres...

 

[cookie]

Longer shocks, I would guess, equal a longer wheelbase

Shep

i'm thinking the longer front shock extends the wheelbase, but the rear shortens it. dunno