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Join Date: Dec 2004
Location: Linville NC
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current thinking on short paralever arm

I know this has been discussed some before and I think I have read most of the posts. Is there any updated information or new thinking on how installing a shorter paralever arm impacts the life of the drive shaft or how this may increase the chances of problems with the shaft. After grinding my center stand down to almost nothing I am considering this option.
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Old 05-30-2006, 10:23 AM
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My thoughts: I will not shorten drive train life. It is the same arm as the GS, and works just fine for them. The bike handles great with one on. I highly recommend it. Oh yeah, ditch the centerstand next.
Old 05-30-2006, 10:49 AM
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What about the GS arm vs. the BCR arm. Are they the same length. I have been told that the BCR arm is shorter that the standard S. I know the shock is a little longer on the BCR, but I wasn't aware that the paralever arm was different on the BCR. Has anyone put 30 to 40 thousand miles on a standard S with the shorter paralever arm?
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Old 05-30-2006, 10:54 AM
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Hi,

I understand that late model S arms are the same as a GS. At least this was what I was told by BMW UK.

I also refused to pay until I had written confirmation that this modification would not cause any issues.

Dun a load of miles since then.

Regards,

Adrian.
PS A search may turn up the the lengths of arm used over the years, but orginally it was the only option to buy a GS arm (or go aftermarket).
Old 05-30-2006, 11:30 AM
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the gs arm and the bcr arm are the same part. Do it, you'll be happy you did. also ditch the center stand.
Old 05-30-2006, 11:46 AM
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Thank you guys. Sounding like I should just ask if anyone has had a negative experience putting on a shorter paralever.
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Old 05-30-2006, 11:49 AM
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Dan My 99 1100S that I rode with you in Georgia has a MAP billet short arm on it. It was on the bike when I bought it with 8000 mi on it. The bike now has 49000 mi with no problems. I haven't had the shaft/final drive apart for anything, so I don't absolutely know , but it seems fine.
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Old 05-30-2006, 02:19 PM
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Dan, if I had to come up with one negative, it would be that the bike sits high. I`m 5`10`` and on my tip toes at stops. However i also have a corbin which seems to kick your legs out a little making it seem even taller.

Regards,
Lane
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Old 05-30-2006, 03:21 PM
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it's probably the seat Lane. I'm running a Rick Mayer modified std seat, std length Ohlins in back, and a GS length para arm. 5'10", 30" inseam. Flat footing.
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Old 05-30-2006, 03:28 PM
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No kidding. Is it a good long distant seat? I`m not overly happy with the corbin.

Later,
Lane
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Old 05-30-2006, 05:05 PM
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i ground the centerstand to bits. eventualy broke the mounting bolt. the kurz paralever arm solved that problem.

i've heard the rumor of it stressing seals within the drive. never ran into anyone with first hand knowledge though. but then i've never met any one who's experienced the imfamous surge.
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Old 05-30-2006, 05:23 PM
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5'10", 30" inseam, Stock seat, short arm, just barely flat foot
Old 05-30-2006, 06:03 PM
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First mod I did on my bike. One of the best bank for the buck mods you can do. Learned about it here in the "early days."
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Old 05-30-2006, 07:04 PM
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The one one my -S- works great, BXR spec, the one on my Rt works great adjustable, 3/4 inch shorter than stock, makes all the diff in the world.
Doit.
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Old 05-30-2006, 07:12 PM
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I've got the STOCK arm on my bike and at 40K miles, I've had the entire rear drive replaced due to a failed main bearing and all the seals in the new drive replaced. I've also replaced a driveshaft that slipped out of phase. I cannot see how a short arm can do any more damage than I've experienced with my stocker.

-Jeff
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Old 05-30-2006, 07:28 PM
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I can't say for sure that this was caused by the shorter arm but almost immediately after installing (at 30,000 miles) I had a seal leak, the big bearing in the drive went out, followed by the needle bearings in the sides. I also noticed the "phase" vibration, which seems to have gone away with all the new parts.
Old 05-31-2006, 09:51 AM
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Old 05-31-2006, 09:51 AM
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