Brühl frames

[arancia]

Tell us more about the Bruhl frame please. Geometry, construction, builder, availability now, etc?

 

[Beucars]

This one was from June 2019
View attachment 56124

I took this photo in St Cergue during the bi-annual retro motorcycle hill climb.

More info on the hill climb: https://www.retro-moto.ch/

 

[Beucars]

More info on Brühl frames:



I've no relation to the builder. Just took a photo of the advertisement

 

[Ernesto]

Tell us more about the Bruhl frame please. Geometry, construction, builder, availability now, etc?

afaik a copy of the Rau-frame.
Builder Burkhard Brühl is a certified and qualified welder. Was even commisioned by the Porsche museum
to build a cage-frame replica

Ernesto

 

[TomL]

More than just a little bit of inspiration from Egli in there I'd say...

 

[andre g]

The former owner is well known and maybe he will post a comment or a video?
Oh, sorry I cut his head

 

[Beucars]

in order to reduce chassis flex it is important to have a solid headstock and swingarm pivot contruction

You may ask yourself if this is the case with large tube frame types such as, Brühl, Egli, Martin, Rau, etc

That said, they are aesthetically very pleasing

 

[arancia]

afaik a copy of the Rau-frame.
Builder Burkhard Brühl is a certified and qualified welder. Was even commisioned by the Porsche museum
to build a cage-frame replica

Ernesto

Thank you. From experiences with repairs of the weaknesses of my Trackmaster frame around the lower engine and swing arm mounts I'd like to see more pictures of that area of the Bruehl with Laverda motor installed if possible please.
I have requested information from the email address in the poster, thank you, I will share anything interesting I get back.

 

[Ernesto]

Just a few more.
btw. this project is for sale, too.
Situated in North Germany (Hamburg).
But won't sell it here before Volki sold his bike.
As I would have hijacked his thread otherwise.

 

[arancia]

My apologies too for taking the discussion off course, no offense if a moderator wants to take this into a separate "alternate frames" or similar topic.
Good photos thank you.
Substantial plates to carry the swing arm pivot loads to the engine cases. That's what I'd had in mind to add outside the frame to supplement the thin swing arm supports on the Trackmaster but only got as far as cardboard prototypes. I'd been looking at how the '74 SFC frame is much more heavily built in that area than the other models' frames. Are the alloy plates part of the Bruehl kit, how thick are the plates?
Here's the spindly Trackmaster in that area, several welds over cracks and breakages.

 

[Paul Marx]

I took this photo in St Cergue during the bi-annual retro motorcycle hill climb.

More info on the hill climb: https://www.retro-moto.ch/

And the border police of the country of Fritz Egli didn't impound it?

 

[chrisk]

Tell us more about the Bruhl frame please. Geometry, construction, builder, availability now, etc

Hmmm, In the interest of not hijacking Volkis post, I have edited this post.

 

[andre g]

As far as I know from people which used Burkhard‘s frames they told me that they worked fine.

 

[Ernesto]

Are the alloy plates part of the Bruehl kit, how thick are the plates?

No, they're not. Could take some time for me to measure them.
Ernesto

 

[arancia]

Hmmm, In the interest of not hijacking Volkis post, I have edited this post.

Thank you and apologies to Volki.

 

[Ernesto]

Are the alloy plates part of the Bruehl kit, how thick are the plates?

11mm

 

[arancia]

11mm

Thank you Ernesto.