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Old 02-06-2011, 08:13 PM   #1
JonnyCash OP
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Joined: Jan 2011
Location: Midcoast, Maine
Oddometer: 1,477
R100 front suspension upgrades?

I've got a frankenbike R100S engine and front end on a SWB /5. I'd like to improve the handling. I was reasonably happy with its handling until I got my tricked out RD350, and now I'm not so happy.What do you all recommend for upgrades? I'd think I'd like to lower the front end a little. I've had the bike for a long time, and it has always made a load clank when the front suspension tops out. Is this just the facts of life, or can I get rid of this? Seems like there would be some kind of bump stop to cushion this effect, but I haven't seen anything like that in there when I've had it apart. Thanks all.
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Old 02-07-2011, 06:25 AM   #2
Jon-Lars
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How large is your budget?
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Old 02-07-2011, 08:42 AM   #3
Wirespokes
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Which front end is on the bike? Are the calipers ATE or Brembo?

It is possible to eliminate the clunk on top-out - they're either missing the rubber bumpers or you can install something called bottoming springs that actually are a better idea than the rubber which tends to deteriorate and clog the orifaces.

If you've got the Brembos then it's possible to install Cartridge Emulators and greatly improve the ride. The ATE front end can be modded as-is since it's already a fairly sophisticated suspension.
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Old 02-07-2011, 05:00 PM   #4
bikerfish
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an aftermarket triple clamp and a fork brace are nice to have also. keeps the noodle effect to a minimum.
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Old 02-07-2011, 05:40 PM   #5
supershaft
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Why can't you put an emulator on an ATE fork? I have seen it done many times. I would not call it advanced as is.

The right preload on the stock springs and the right oil can make a big diff on their own.
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Old 02-07-2011, 08:59 PM   #6
Wirespokes
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Quote:
Originally Posted by supershaft View Post
Why can't you put an emulator on an ATE fork? I have seen it done many times. I would not call it advanced as is.

The right preload on the stock springs and the right oil can make a big diff on their own.
No reason you can't put emulators in the ATE forks, I'm just repeating what I've heard. It's also not as easy as the later ones and I've heard the emulators won't make that much of a difference. On top of that, a set of ATE forks in good condition and well se-up handle very well. I don't see any reason to fool with them.

I'm not a fan of the stiffer springs that I often find in these things. They make the ride so stiff that every little bump transferrs to the bike. Guys attempt to remove the brake dive with stiffer springs and loose that wonderfully compliant front suspension. The better approach is to learn how to ride these things without jamming on the front brake. That's the way to eliminate the brake dive.

The ATE front ends have a rubber bumper at the bottom to stop the clank on top-out. They should be available from the dealer, but the top-out springs, I don't know. They're just a spring as I recall, and perhaps a spring shop could duplicate them. I've got some around here somewhere, but have no idea what rate they would be, though I could give the dimensions.
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Old 02-07-2011, 08:03 PM   #7
JonnyCash OP
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Quote:
Originally Posted by Wirespokes View Post
Which front end is on the bike? Are the calipers ATE or Brembo?

It is possible to eliminate the clunk on top-out - they're either missing the rubber bumpers or you can install something called bottoming springs that actually are a better idea than the rubber which tends to deteriorate and clog the orifaces.

If you've got the Brembos then it's possible to install Cartridge Emulators and greatly improve the ride. The ATE front end can be modded as-is since it's already a fairly sophisticated suspension.
I've got the ATE front end. Where does one get the bottoming springs? I find that clank to be quite irritating. It really stands out to me, as otherwise the bike makes me say "What a nice machine this is" every time I ride it.

You say the ATE front end can be modded as-is. What do you recommend? Are there aftermarket springs that help? Different oil? I remember a long time ago I had a catalog from San Jose BMW/CCproducts, who had all kinds of hot-rod parts, but I can't seem to find anything about them, or anything else like them for old beemers.

Thanks everybody for your responses, I appreciate it!
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Old 02-07-2011, 08:22 PM   #8
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More than likely... Racetech

I suspect you will contact Matt Wiley (mwiley@racetech.com) at Racetech. I do not have personal on road experience with their stuff yet, but am in the midst of installing a gold valve and springs on my R75. I have yet to hear ANYTHING negative about their products or support, except for price, but we are all notoriously cheap. Matt has been super helpful in answering my questions. I will post the build at some point, but it is pretty straightforward so far.
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