Building a race bike

You wanna see my German roots?
Grand Mother from Heilbron and Grand Father from Hombourg auf der H?he.
On the paternal side.

Maybe explains my unfailing logical thinking, and always being right.

Paul
 
Paul Marx said:
You wanna see my German roots?
Grand Mother from Heilbron and Grand Father from Hombourg auf der H?he.
On the paternal side.

Maybe explains my unfailing logical thinking, and always being right.

Paul
Click to expand...

Heilbronn = Gelbf?ssler ( yellow feet from walking through rapeseed fields barefoot)
Bad Homburg vor der H?he =  the filthy rich that moved out of Frankfurt

Does that fit you Paul? :D
 
Gerald said:
Heilbronn = Gelbf?ssler ( yellow feet from walking through rapeseed fields barefoot)
Bad Homburg vor der H?he =  the filthy rich that moved out of Frankfurt

Does that fit you Paul? :D
Click to expand...

Yes, totally. My Grand Mothers parents from Heilbronn were grain merchants.

My Grand Fathers Father was a kosher butcher in Bad Homburg which was the jewish quarter of Frankfurt. No doubt the filthy rich moved in when the Jews had been dispensed with.

Paul
 
GregT said:
Julian - all that weight saving on the rims and hubs will go for nothing if you still have to run tubes.....

Have you worked out a way to run without them ?

Your project is around the weight limit for wire wheels IMO. I've got plenty of experience with heavier Post Classic race bikes where changing to cast wheels made a huge difference to the handling. Wheel stiffness becomes very important with the modern sticky race rubber.
Click to expand...
Well .... if he DIDN'T drill them AND ran tubes, it'd be heavier than what he's gonna get now! Pure logic ... Paul would have come in with this assertion at some point  :-*

And I have heard about significant improvements in handling on race tracks with cast wheels and sticky hoops, Greg. I'd have to swap from one to the other on the same rubber to make my own mind up. Pretty hard to imagine Marquez on his Honda ... and spoked wheels!!!

I'm using 17 inch spokers on my SFQ, mainly because I just love the way they look - and it's not a race bike. But I have tried to make them strong. On the bike's previous incarnation, they were certainly strong enough to show up the suspension setup issues with modern wider rubber fitted!

Of course, if someone wants to race in certain classic classes, then spokes may be the only option.
 
Paul Marx said:
Yes, totally. My Grand Mothers parents from Heilbronn were grain merchants.

My Grand Fathers Father was a kosher butcher in Bad Homburg which was the jewish quarter of Frankfurt. No doubt the filthy rich moved in when the Jews had been dispensed with.

Paul
Click to expand...

Yes, yes, yes ........ but do you have yellow feet?

Jim
 
well - easy to fix, the yellow feet came from the socks the military was wearing... so - get yourself some yellow socks and you get in touch with your haritage ...  :D

Badenser_Gelbf%C3%BC%C3%9Fler_-_panoramio_%281%29.jpg
 
GregT said:
Julian - all that weight saving on the rims and hubs will go for nothing if you still have to run tubes.....
Click to expand...

He could dip the tubes in hydrochloric acid quickly to dissolve some of the rubber. Could save a few grams doing that ....... if he remembers to rinse them in water afterwards.

Jim
 
Laverdalothar said:
well - easy to fix, the yellow feet came from the socks the military was wearing... so - get yourself some yellow socks and you get in touch with your haritage ...  :D

Badenser_Gelbf%C3%BC%C3%9Fler_-_panoramio_%281%29.jpg
Click to expand...

Haha, my ancestors weren't accepted in the German military in the 19th century.

Paul
 
This home detention has driven people crazy, FFS!
The comment was "heavy bikes" benefitting from cast wheels. When you see how hard the supermonos and all the earlier (Pre ?80s) classes run in classic racing here on wire wheels you see that they can't be too much of a handicap.
 
Tippie said:
This home detention has driven people crazy, FFS!
Click to expand...

I know right. Here I was looking at yellow feet, trying to work out what yellow feet and Germany flora hand to do with race bikes. But, then I remembered flying into Frankfurt in the early 90?s and asking what all the yellow fields were. Age has wearied my memory, and the fact that I had been drinking the whole flight, but I think it was sun flowers or soya, or something. Those crazy German farmers.
 
Hi all,
PicS attached.

38mm Drum type is just meaning without brackets for calipers. ie,  Type of fork for drum brakes.

Wheels are going to have tubes, but you can buy light weight racing tubes.  I can modify the wheels to run tubeless, it's not hard and I have done it before, however! this is a race bike, it is intended to run at full speed and or full effect at all times,  a tyre deflation could be fatal, this is not a risk I will take with someone eases life. I can live with the weight of two tubes for that reason.

Alloy wheels, although these could be used in some classes, they are not allowed in others, I don't like the look of them either and especially on a bike with drum brakes, so these are not an option.
Strength,  well, spoked wheels are far easier to check for damage and condition at track-side than alloy wheels so for safety alone and for this reason for me spoked wheels are an advantage. 
The wheels will far exceed the frame stiffness in my opinion so little point worrying here.
End goal weight.  Absolutely as low as it is feasibly possible within the rules!! Remember that the new crank will weigh about half of a std stroke SFC light crank, and Titanium rods are on order, the primary gear drive has saved over a kilo, etc. but really hoping to be below 150kg and the absolute goal is to be on the grid at 200kg with rider.
I may be dreaming here but you have to have a goal and a dream in order to achieve it!    (hahaha)

Next job is to modify the fork lowers and wheel hubs to take a hollow tube spindle for more weight reduction and less un-sprung weight

Jules



 

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Julian,
can you do me a favor and weigh them (without the crate 8)
Thanks
Michael

PS : with a lightened crank and primary drive as you have done you will come to less than 150. 200 kg with rider and helmet and leathers is ....possible
Cheers
 
Beautiful pair of forks, Julian. Might not be lighter than Ceris, but they'll certainly offer less stiction and more adjustability.

Did you lose the keg from the primary through the drive sprocket, chain and clutch alone?  I gather you're looking for a jockey-sized pilot for it!!
 
Hi Julian,
I think you need to aim for the bike to weigh towards 120kg to meet overall weight of bike&rider = 200kg.

Titanium rods I assume specially made?  By who ? Just very interested something to keep in mind for my own race engines.

Very interesting thread,
Andy
 
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