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ADAPTING BST's to CARC

ghezzi

High Miler
GT Contributor
Joined
Jul 7, 2011
Messages
830
Location
Brisbane
I'M INVITING ANYBODY WITH ENGINEERING QUALIFICATIONS or SKILLS TO CONTACT ME OFFLINE
Best contact: wayne @ bike tow brisbane . com .au (w/o the gaps)

After Todd's unsuccessful attempt to get BST to make wheels for our bikes I've continually dreamt of somehow achieving this goal. A fellow 2 stroke owner has offered me a set of BST wheels for an Aprilia RS250 at a good price.

They are a 3.75" x 17" front and a 5" x 17" rear. The slightly wider than normal front apparently is de rigueur for racing/track day tyres for better edge grip. The 5" rear will suit me fine as I was wanting to downsize my rear tyre to a 160 or 170 for better turn in, I only have 76RWHP to contain.

Front wheel is easy adaption. RS250, most big block Guzzi's and Ducati 916 to 996, Monsters etc. use the same Brembo 10mm disc offset with 6 bolt x 80mm PCD & 64mm centre hole. Spacer plates can be purchased for 16GBP a pair from;
http://www.projection-components.co...apriliacagiva-6-bolt-various-widths-468-p.asp
Caliper spacers are the other alternative. Axle spacers are a 5min job for any machinist.

The rear wheel solutions are many, best method will only be determined when I receive the wheels, next week I hope.
BST themselves are not openly encouraging me to undertake this exercise. However, I shall pursue the dream. I intend to remove (unbolt) the BST alloy sprocket and disc carriers, and manufacture my own adapters.

The 17" conventional wheels are all of the 5 slanted spoke Black Diamond design. The disc carrier is attached by 5 x M6 CSK cap screws with thread inserts bonded on the inside of the CF. The left or drive side hub is attached by 5 x M8 CSK cap screws but with a s/s sleeve and nyloc nut inside the CF hub. The wheel cannot be reversed due to slanted spokes.

I intend to manufacture a Ducati style axle as per the top right half of the following photo, round plate bolted to crownwheel serving also as a Guzzi disc mount. No drive pins for the Guzzi, our cush drive is in the transmission.

Ducati hub4
 
Next;
On the CARC (of my Bellagio) there will be 40mm space between the back of the crownwheel and the carbon portion of the rhs of the BST wheel centre. This side will just have matching spacer/flanges between shaft and rhs alloy boss attached by the 5 x M6 CSK cap screws.

The shaft passing thru the centre of the wheel will be splined on the lhs so as to attach the following type component. The PCD of the 5 mount holes is smaller than the PCD for the 5 x M8 CSK cap screws of the BST hub, but you get the gist of what I am trying to achieve.

Untitled
 
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