Steel Thunder Custom Cycles Motorcycle Parts store for Harley-Davidson and custom bikes.

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Steel Thunder Custom Cycles
3418 Teagues Road
Marshfield, MO 65706
417-468-2326

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Kraft Tech motorcycle frames are made in the USA. Rigid frames . Rigid Motorcycle Frames

Kraft/Tech and other manufacturers. All Kraft/Tech frames are made in the USA. All frames come complete with Manufacturer's Statement of Origin (MSO), shipped separately.

MORE FRAME STYLES

FREE SHIPPING!*

Note: As with any frame-up custom build project, it is common shop practice to pre-assemble the entire motorcycle prior to any paint work for compatibility verification of all parts used.

You will get a catalog with your frame containing all the parts you need to finish your project.

Bobber Style frame fits 180mm Tire with 1-1/2" Belt or 200mm Tire with Chain

Bobber style rigid frames for wide tire big twin motorcycles.

neck detail of bobber style motorcycle frame for wide tires.

Axle end detail of bobber motorcycle frame for wide tires. Up to 200mm.

Frame detail - bobber motorcycle frame for wide tires.

Frame detail for bobber style wide tire motorcycle frame. Accepts Panhead, Shovelhead, or Big Twin Evolution Engine.

RIGID FRAMES FOR WIDE TIRE BIG TWIN - Kraft Tech

4 or 5 Speed.
180mm Tire with 1 1/2" Belt or 200mm Tire with Chain.
1 1/2" O.D. Drawn Over Mandrel (DOM) ASTM A513-96T5 .188" wall tubing for backbone strength.
1 1/4" O.D. x .120" wall thickness tubing for cradle and tail strength.
Additional clearance built-in at backbone for Evolution style engine with up to .200" taller cylinder/head length. Allows rear rocker box to be serviced without removal of entire engine.
TIG welded in high stress areas.
Dual gussets at front and rear motor mounts and at transmission mounts.
Boxed lower seat post mount.
Welded-on exhaust hanger mount.
Fully machined hour glass style steering neck.
Fork lock tab.
Softail style seat front mounting tab.
Chrome 3/4" O.D. axle kit with axle adjusters, left side spacer and nut.
Polished rear pulley spacer (.900" thick) with mounting bolts.
Weld-on seat post coil mount.
Designed for use with a Panhead, Shovelhead or Big twin Evolution engine.
Includes Manufacturer's Statement of Origin (MSO), shipped separately. Made in the U.S.A.

Part#: M20004 - 30° Rake, No Downtube Stretch ... $921.76 including free shipping*

Part #: M20005 - 34° Rake, 2" Downtube Stretch Price ...$966.79 including free shipping*

 

Required Components:
Four of five speed solid mount transmission and matching mounting plate.
Chain or belt final drive.
Softail 1986/1999 rear wheel hub.
FL, FX 1973/1983 chain drive rear hub, use with polished pulley spacer (1.090" thick) kit MU77365.
Softail Late 1987/1999 rear brake caliper and mount.
Flatside Fat Bob gas tanks and mounts.
Softail style oil tank and mounts 1986/1999.
Removable-type fork head cups.
Axle adjuster bolts, Softail 1987/1999.
Rear fender clamps for 1 1/8" O.D. tubing.

Standard Style Rigid Motorcycle Frame for Big Twin.

Extra Gussets to improve engine mount stability.

Extra gussets to improve engine mount stability.

Close up of cross bar.

BOBBER KITS WITH THESE FRAMES

Standard Style Rigid Frame for Big Twin - standard with 4 or 5 speed chain drive - Hardbody

These rigid frames have all the rugged good looks of those found years ago but built with the technology of the 21st century. Today's high output engines require the utmost frame strength, as well as good brakes. These HARDBODY Frames were designed and manufactured with both in mind. Made to fit Panhead, Shovelhead or Big Twin Evolution with solid mount engine. A Manufacturer's Statement of Origin is included.
1 1/2" O.D. Drawn Over Mandrel (DOM) .188" wall tubing for backbone strength.
1 1/4" O.D. Drawn Over Mandrel (DOM) .120" wall tubing for cradle and tail strength.
Additional clearance built-in at backbone for Evolution style engine with up to .200" taller cylinder/head length. Allows rear rocker box to be serviced without removal of entire engine
Will accept 4 or 5 speed transmission.
TIG welded on all new hardened tooling for the most accurate fit possible.
Dual gussets at front & rear motor mounts and at transmission mounts.
Boxed lower seat post mount.
Welded on exhaust hanger mount.
Fully machined hour glass style steering neck.
Fork lock tab.
Softail style seat front mounting tab.

Part#:M20008- 30 degree Rake and No Down tube stretch, will accept 4 or 5 speed tranny .. $780.52 including shipping *                                                    

Part#:M20009 - 34 degree Rake and 2" Down tube stretch ... $827.35 including shipping*                         

Hardbody rigid frame for 200 wide tire rigid motorcycle.

 

Hardbody rigid motorcycle frame has single downtube.

Detail shown: custom axle caps on rigid motorcycle frame.

Detail shown of welded-in transmission mount on rigid motorcycle frame.

Rigid motorcycle frame comes with fork stops, shown in this detail view.

Rear view of rigid frame with welded in transmission mounting plate.

RIGID FRAME FOR WIDE TIRE BIG TWIN - Hardbody

200 mm Tire with 1 1/2" Belt.
3/4" O.D. Rear Axle with Custom Axle Caps.
Order M56256 for optional 1" O.D. Rear Axle (below).
Welded-in Transmission Mounting Plate.
Fork Stop Plate with two different mounting positions for your choice of turning radiuses (requires flat type lower Fork Bracket).
1 3/4" O.D. single Downtube.
1 1/2" O.D. Backbone.
1 1/4" O.D. Engine Cradle and Tail Section.
100% TIG welded construction.
Designed for use with an alternator type Shovelhead or Big Twin Evolution engine.
Includes Manufacturer's Statement of Origin.


Part #: M20049 - 40° Rake, +4" Downtube Stretch, +1 1/2" Backbone Stretch ... $1449.88 including FREE SHIPPING*

Part #: M56256 - Rear Axle, 1" O.D., Fits M20049 Frame when using wheel with 1" I.D. bearings
56.19 ordered with frame as option.  (Call to purchase alone, shipping will be added.)

Options:
Required Components: (you will get a catalog)
Left side drive Softail type (frame mount) Transmission.
Custom flat type lower Fork Bracket suitable to mount the Fork Stop Plate to 36664 steering bearing races (headcups not required) 1986/1999.
Softail style Forward Controls.
Custom fabricated Seat, Gas Tank Mount and Exhaust.
Primary Drive with 1/2" offset Engine Sprocket/Pulley.
1/2" wide Primary to Engine Spacer.

Paughco Rigid Frame for Sportster®

This MIG welded frame with stock 0 degree rake and no stretch is made of 1020 DOM steel and is designed to accept Sportster motors.

#VT51-2182 - For Sportster® motors 1957 thru 1976 with mechanical brakes. Comes WITHOUT Fat Bob® gas tank mounts ... $998.82 including free shipping*

PLEASE NOTE:  Only Sportster frames accept Sportster motors.

Many more frame styles: Frame/Body Section

Confused about frame terminology? See tech tip #9. See tech tip #10 for a rake and trail calculator. TECH TIP PAGE

*FREE SHIPPING APPLIES IN CONTINTENTAL 48 UNITED STATES ONLY. AK, HI and APO/FPO will have additional shipping fees. We ship only within the U.S.A. and to APO/FPO (military addresses; weight and size restrictions apply.). We do not accept foreign credit cards. Sorry, we do not ship to Puerto Rico.

Prefer to call in your order to Steel Thunder? Call toll-free: 1-866-889-7828. 9-5 CST M-F.

FREQUENTLY ASKED QUESTIONS

Please note that all prices are subject to change.

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Steel Thunder Custom Cycles

3418 Teagues Road

Marshfield, MO 65706

417-468-2326

We hope you'll come visit us ... we'd love to see your ride!

 

 

With God All Things are Possible!

 

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