Thunder Crank Technology
Our Performance Experience is YOUR Performance Edge!
Top Fuel Drag Racing is one of the most abusive forms of racing. Over a hundred
times more stress is placed upon the components.
R&B Cycles realized through experience that the need to replace
complete flywheel assemblies after one or two races was impractical,
time consuming and outrageously expensive. John "Red" Rhea,
owner, found that the tapers on the shafts of conventional, OEM-style
flywheel assemblies would either distort or actually break after
being subjected to continued stress of Top Fuel competition. There
had to be a better way!
R&B Cycles has developed a revolutionary new crankshaft for
Harley Davidson Motorcycles (Thunder Crank)
utilizing a hex design on the shafts and crankpin to lock everything Rock
Solid. Every piece of this crankshaft is made from high
strength billet steel with a very tight machining tolerance
of less than .0005", then heat treated. The current design
uses a 1.500 diameter crankpin with a press on race made of 52-100
bearing steel and then heat treated.
Pinion Shaft Designs:
| 1) Stock
Length Big Twin
2) .375 Extended Big Twin
3) 4 Cam Delkron
When the Thunder Crank is assembled it can not
be shifted or moved. "It is made true to stay true
no matter what!"
Over the last several years of performance testing in the 1997
ADBA National Champion Pro Dragster machine, and our own Music
City Warrior Pro Fuel bike, we have experienced zero failures
while using the same crankshaft assembly in
each dragster! These Thunder Crank assemblies
are still in use and still in true! In
both of the aforementioned racing programs, crankshaft crankshaft
assembly maintenance has been cut by 80%!
Our Thunder Crank are available
in strokes from 4 1/4" to 5 1/4". This will
work in all racing and big inch enginesusing Big Twin crankshafts.
We are currently working a street version for use with the 1
1/4" (stock size) crankpin and rod setup.
For more information about these products as well as other services give
us a call or come by and see us.