Offset MRW BEADLocK Rock Crawler Wheels Off Road Wheels Racing Wheels

MRW 33

BEADLocK AND NON BEADLocK RACING WHEELS AND OFF ROAD ROCK CRAWLER WHEELS BY MRW

MANUFACTURERS OF "CUSTOM BUILT" MOTORSPORTS WHEELS SINCE 1955

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MRW ROCK CRAWLER WHEELS 15" | 16" | 16.5 | 17" | 18" | 20"

MRW OFF ROAD WHEELS 15" | 16" | 16.5" | 17" | 18" | 20" | 22"

"QUICK CLICK" RACING WHEELS

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IMPORTANT ORDERING INFORMATION "click" to see more

The backspacing (sometimes called offset) is the distance from the inside surface of the dished center (B) to the inside rim lip (A).When you're ready to buy a new set of wheels, measure the backspacing of the wheels that you know work - the ones on the vehicle.

HOW TO MEASURE BACKSPACING FOR MRW WHEELS

1. Place the wheel (without tire) on a flat surface like a kitchen table or smooth level work bench with the valve stem up toward the ceiling.
2. Put a ruler down through the center hub hole.
3. With the ruler touching the table notice where the bottom side of the center touches the rule- That's what we call the wheel backspacing .

4. If you plan to purchase a wheel with more or less backspacing or are changing to a different size or width wheel or tire take special care to make certain the inside diameter of the bell of the wheel clears brake caliper (#3 diagram) or brake shoe, and also when you turn full left or right the tire or wheel will not rub the vehicles body, tie rods, struts, or other suspension parts at maximum spring compression or no compression.

WHEN ORDERING DOUBLE BEADLocK WHEELS "EXTREME CARE" MUST BE TAKEN ALSO TO CHECK FOR INTERFERENCE OF THE BACK BEADLOCK WITH THE BRAKE CALIPERS, VEHICLES BODY, TIE RODS, STRUTS, OR OTHER SUSPENSION PARTS

1. HUB

2. BRAKE ROTOR

3. BRAKE CALIPER

4. AXLE

5. STUD

G. VALLEY INSIDE DIAMETER
H. BELL inside DIAMETER
I. CENTER OF AXLE TO OUTSIDE EDGE OF CALIPER
X. BACK BELL DEPTH
Z. FRONT BELL DEPTH "

A. INSIDE RIM LIP

B. DISHED CENTER

C. INSIDE VALLEY EDGE

D. CENTER WELD POINT

E. OUTSIDE VALLEY EDGE

F. OUTSIDE RIM LIP

RIM VALLEY "G" INSIDE DIAMETER ----- AND "X" BELL DEPTH
	13" WHEEL	15"WHEEL	16"WHEEL	16.5 WHEEL	17” WHEEL	18” WHEEL	20"WHEEL
VALLEY ID "G"	11.248	12. 620	13.479	13.479	15.470	16.250	18.375-Standard-Bead 17.375-Extra-Wide-Bead as Military
BELL DEPTH "X"	3”	3 ½” & 5”	3 ¾”	3 ½”	4”	3”	2”

"click" MRW PRINTABLE CATALOG "click"

PLEASE READ CAREFULLY BEFORE ORDERING

The the backspace (sometimes called offset) is the distance from the inside surface of the dished center (B) to the inside rim lip (A). (technologically the offset of a wheel is determined by measuring plus or minus from the center line of a rims width, this dimension changes for each rims width. So for simplicity MRW will use the tried and true backspace measuring terminology).

On a 15x8" wheel this backspace dimension can be anywhere from 1" to 5". :-: Notice when measuring backspace, (H) & the inside depth of the bell must clear the brake calipers (3), and (A) and the bulge of the sidewall and the outside diameter of the tire clears the vehicles body and steering assembly when turned to the extreme left or right at full spring compression or zero weight (jacked up) no compression .

The same holds true for 15x10" and 15X12" wheels because the only dimension that changes is the width of the 'valley.'

While it may appear that the backspace range should increase with the width of the valley, actually the critical dimension is the distance between the inside rim lip (A) and the inside valley edge (C). In the illustration at the top you will see that it is labeled (X) and has a dimension of 4". Regardless of the width of the wheel, X will always be 4" and Z will always be 1.5" in the case of MRW wheels. (There is an exception to this in our 'Wide Back Bell' shells. In this case X is increased to 5".)

MAXIMUM BACKSPACING

If (I) x2 (times 2) is greater than 12.125" (G), obviously your maximum must be just under 4". Otherwise the caliper will hit the valley of the wheel.

MINIMUM BACKSPACING

The minimum backspace is determined by the 'dish' of the center and the Back Bell Depth (X). While the typical center is 2-1/8" deep, part of that is the weld surface, leaving only a part of the actual center depth to work with. Also, the actual flat weldable part of the valley is shortened by the curve of the valley wall.

Placing the center at the extreme usable edge of the valley gives only a 3" backspace.

SO HOW DO WE GET LESS THAN 3" backspace?

By turning the wheel around and putting the Front Bell on the inside. This time when we put the center at the extreme weldable surface of the valley, we achieve and backspace of 1".

Normally, you don't need to worry about how we do it when you order wheels from us. We've been doing it a long time. We automatically orient the wheel to get the specified backspace. If it's from 1" to 5". However...

COMPLICATIONS

While we fabricated our shells (rims) and centers to exact specifications, the actual 'dish' and 'weld surface' of the centers can be different from the figures given here. For example, the dish of a Wide 5 bolt pattern is less than a 5 on 5 pattern. Some centers are only available in a flat configuration - with no dish at all! A flat center limits the to 4-1/8"

Another complication is the matter of other support and steering members installed on the vehicle. It is possible to build a wheel that clears the hub and brake calipers but still won't work because it bangs into the steering assembly when the front wheels are turned. Not good.

YOUR BEST BET

When you're ready to buy a new set of wheels, measure the backspacing of the wheels that you know work - the ones on the car.

HOW TO MEASURE BACKSPACING

1. Place the wheel (without tire) on a flat surface with the outside up (hub side down).

2. Put a ruler down through the center hub hole.

3. note where the bottom side of the center plate strikes the ruler - That's the backspacing.

THERE IS NO SUCH THING AS A 'STANDARD' BACKSPACING! (OFFSET!)

There are too many variations between car and axle manufacturers. 2", 3", and 4" backspacings are popular and common, but not standard. We depend upon you to give us accurate backspacing measurements. If you don't, you may have just purchased a very expensive set of paperweights or flower pots .

DETERMINING YOUR BOLT PATTERN

MEASURE 4-6-8- HOLE FROM ONE STUD HOLE CENTER TO THE OPPOSITE STUD HOLE CENTER

MEASURE –5- HOLE FROM CENTER OF A STUD HOLE-- SKIP A HOLE --TO THE OUTER EDGE OF THE NEXT STUD HOLE

"click" MRW PRINTABLE CATALOG "click"

MRW

MANUFACTURERS OF "CUSTOM BUILT" MOTORSPORTS WHEELS SINCE 1955

BEADLocK WHEELS OR NON BEADLocK WHEELS

ROCK CRAWLER WHEELS ROCKCRAWLER WHEELS - ROCK CRAWLING WHEELS - OFFROAD OFF ROAD WHEELS - MUD RACER MUDDER MUDDIN RACING WHEELS - SWAMP RACER SWAMPER SWAMPIN RACING WHEELS - BOG BOGG RACER BOGGER BOGGIN WHEELS - ROCK RACING WHEELS - STOCK CAR RACING WHEELS - CIRCLE OVAL TRACK RACING WHEELS ROUNDEROUND RACING WHEELS - SHORT TRACK RACING WHEELS - DRAG RACING WHEELS - DIRT TRACK RACING WHEELS - ASPHALT TRACK RACING WHEELS - RALLY VINTAGE RACING WHEELS - SPRINT CAR RACING WHEELS - BAJA RACING WHEELS - DESERT RACING WHEELS - SAND DUNEBUGGY SANDRAIL RACING WHEELS - OUTBACK RACING WHEELS - WOODS RACING WHEELS - BONNEVILLE LAND SPEED WHEELS - GO KART RACING WHEELS - ICE RACING WHEELS - LAWN TRACTOR LAWN MOWER RACING WHEELS TUNDRA RACING

WHEELS - TRACTOR PULL WHEELS - SLED PULL WHEELS - BRUSHCRUSHER WHEELS - HILL CLIMBER CLIMBING WHEELS -TUG OF WAR WHEELS - GULLY RUNNER WHEELS - SWAMPER SWAMP WHEELS- - DRIFTING WHEELS - WHEELEN WHEELS - PULLING WHEELS - JUMPING WHEELS - TRAIL RIDING WHEELS - ANTIQUE WHEELS RESTORATION WHEELS - HOTROD WHEELS - ROBOT VEHICLE WHEELS - MOTORING WHEELS - BACKROADS SITESEEING WHEELS - OR FOR JUST SHOWING OFF WHEELS

AND MANY MORE

www.rockcrawler-mrt.com

MRW WHEEL APPLICATION CHART
A	5X4 ½	OLDER FORD & CHRYSLER PRODUCTS
A+	6X4 ½	DODGE DAKOTA PICKUP 95 & OLDER
AE	5X165.1	LAND ROVER
B	5X4 ¾	CHEVY CAMARO & MOST OLDER FULL SIZE CHEVOLET
C	5X5	GRAND NATIONAL & MOST OLDER FULL SIZE GM CARS & PU
D	5X5 ½	½ TON FORD PU MOST JEEPS INTERNATIONAL SCOUTS
E	6X5 ½	MOST OLDER CHEVY & GMC PU SOME LATE BLAZER DATSUN & DODGE 50
F	8X6 ½	ALL 8 HOLE ¾ TON PICKUP
F+	8X170	2001 & LATER FORD PICKUP
G	5X7 ¾	OLD WIDE 5 HOLE VOLKSWAGON
H	5X10 ¾	MODIFIED 37 FORD SKELETON OR WIDE 5 PATTERN
I	6X5	6-PIN SPRINT CAR 5/8 DRIVE PIN
I	6X5	6-PIN MIDGET 1/2" DRIVE PIN
K	4X98	FIAT
L	4X100	CHEVY CHEVEVETTE PLYMOUTH K-CAR ISUZU PUP & RENAULT
M	5X100	ALL GM A, J, & X BODY FRONT WHEEL DRIVE & SOME MOPAR
N	4X4	VEGA & GM ’80 & OLDED SKYHAWK STARFIRE ASTRO & SUNBIRD
O	5X4	PLYMOUTH DUSTER SCAMP VALLANT DODGE & “A” BODY MOPAR
P	4X4 ¼	PINTO SOME T-BIRDS OTHER FORD SMALL CARS & SOME PORSCHE
Q	4X110	SOME RENAUIT & MAZDAS
R	4X4 ½	OLDER MUSTANGS & CAPRI 6 CYL SOME DATSUN MG MAZDA & TOYOTA
Sx	4X120	SOME MAZDA & HONDA
-T	4X130	VOLKSWAGON & SOME PORSCHE
Ux	4X140	SUBARU
V	6X8 ¾	MILITARY PULL TRUCK ROCKWELL
W	6X7 ¼	MILITARY PULL TRUCK
X	6X8	MILITARY PULL TRUCK
X+	6X205	MERCEDES UNI-MOG
Y	8X83/4	VOLVO 303
	5X67/8	BUDD OLD MILITARY M-15 M-37 OLD 1 ½ TON TRUCKS
	5X135	FORD EXPIDITION F 150 PU 02 ON