K11 Owners Group

Geoffm · Posted: Sat Feb 02, 2008 3:52 am Post subject: Brake disks

Anyone had anything to do with the PFM or Grimeca aftermarket replacement disks. I have a K100-16v with very thin disks. The PFM ones (from motorworks.co.uk) are cast iron, so should stop a bit better. The Grimeca ones are stainless like the BMW OEM ones. Both come with the bobbins and are a lot cheaper than BMW originals.

Second question - anyone used Progressive springs in their K? I see some comments on WP and Racetech, which are not available here or the UK.

How hard is it to replace the fork bushes? I think I have some wear in there. What do they cost?

It is getting to the stage where I might trade it for something Japanese, as it will be cheaper than the repairs.
Geoff

Jim · Posted: Sat Feb 02, 2008 12:47 pm Post subject: WP springs

WP lists dealers in NZ and UK: http://www.wpsuspension.com/company/importeur.php

New Zealand
RCM Performance
Post Office Box 54
Kumue 1250 Auckland
Tel: +64 98382036
Fax: +64 98382136

Full Travel Racing Suspension
Unit 19B Hillside Business Park
Kempson Way
Bury St. Edmunds
Suffolk
IP32 7EA
Tel: +44 1284 752102
Fax: +44 1284 763082

A bike suspension expert I spoke with recommends linear, rather than progressive springs.
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

Mystic Red · Posted: Sat Feb 02, 2008 2:00 pm Post subject:

Daniël V · Posted: Sat Feb 02, 2008 3:51 pm Post subject: Re: Brake disks

chopper_harris · Posted: Sat Feb 02, 2008 6:30 pm Post subject:

The PFM disks are a bas**rd to maintain. At the first sniff of rain, they develop and nasty red rash (iron oxide, aka rust).

This is covered extensively on the Motorworks forum, but essentially the high coeficient of friction is not suffucient to off-set the constant hassle of cleaning the rusty mess off the disk carriers and the wheel rims.

Bassano Grimeca are decent quality, and low maintenance. They have a lower chrome content than the OEM disks, and have a bite somewhere between the OEM and the PFM.
_________________
C1 200 (2001)
R100 RS (1990)
NSU Quickly N (1964)
Honda 400/4 F1 (1977)
MotoGuzzi 1000C (1978)
Suzuki TL 1000 R (1999)
Kawasaki KLV1000 (2005)
K12R Sport (2007) - Wifeys

Technician · Posted: Mon Feb 04, 2008 12:54 pm Post subject:

I had PFM cast discs on my K100LT and as previously mentioned they did develop a thin rusty coating when wet but this was displaced at first application. I also felt that the braking quality was far superior. Strangly enough the cast disc on the rear never gave me any rust problems at all.
It's all down to personal choice.
_________________
Fat Ba***d with a K1100LTse
Squire D18 trailer
Garmin Zumo 660
"Run it round the block to see if the wheels fall off!!!!"

Geoffm · Posted: Sat Feb 09, 2008 6:54 pm Post subject: Disks

Thanks to all for the comments. In the end, i went for PFM disks, which are somewhere on their way to me.
Motorworks came out around 10% cheaper than Motobins (with Grimeca disks) overall, and it will be interesting to see how the PFM disks perform.
Watch this space...
Geoff

tmoons · Flying Brick Rider Joined: 09 Oct 2008 Posts: 161