RACING OFF ROAD ROCKCRAWLER BEADLocK AND NON BEADLocK  WHEELS  BY  MRW

MANUFACTURERS OF "CUSTOM BUILT" MOTORSPORTS WHEELS SINCE 1955

 

1-800-643-3625

PHONE 1-479-524-7624 OR 1-479-524-4157 IF 800 NUMBER IS BUSY

www.mrtwheels@yahoo.com

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OUTLAW RACING WHEEL STAGE II RACING WHEEL STAGE III RACING WHEEL STAGE IV RACING WHEEL ULTRA STAR RACING WHEEL ECONO STAR RACING WHEEL RALLY  STYLE WHEEL
MOTORSPORTS ACCESSORIES TECHNICAL HELP MRW ORDERING INFORMATION MRW CONTACT US MRW HOME PAGE RACING BATTERIES
MRW  OUTLAW RACING WHEELS MRW STAGE II RACING WHEELS  MRW STAGE III RACING WHEELS MRW ULTRA STAR RACING WHEELS MRW ECONO STAR RACING WHEELS RALLY  STYLE WHEELS
ROCK CRAWLER WHEELS   15" | 16" | 16.5" | 17" | 18" | 20"    HOME
OFF ROAD WHEELS  15" | 16" | 16.5" | 17" | 18" 20"    HOME

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MARSH RACING WHEELS 

16951 LOGAN CAVE ROAD

SILOAM SPRINGS, ARKANSAS 72761

Toll Free --- 1-800-643-3625

Local --- 479- 524-4157

FAX --- 479-524-5168

www.mrt-wheels.com

www.rockcrawler-mrt.com

mrtwheels@yahoo.com 

THE BEST KEEPS GETTING  BETTER 

WHEEL OFFSET OR BACKSPACE

The the backspace (sometimes called offset) is the distance from the backside surface of the dished center  to the backside rim lip . ( technically 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 method ). 

FIND YOUR WHEEL BACKSPACE OR OFFSET

 

FIND YOUR WHEEL BACKSPACE

ENTER WHEEL WIDTH INCHES ENTER WHEEL OFFSET MILLIMETERS YOUR WHEEL BACKSPACE INCHES
 FRONT OF WHEEL INCHES

FIND YOUR WHEEL OFFSET

ENTER WHEEL WIDTH INCHES
CHOOSE WHEEL OFFSET 
ENTER WHEEL BACKSPACE INCHES THIS IS YOUR OFFSET MILLIMETERS

 

IMPORTANT WHEEL MEASURING 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 your 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

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 12.625" (G) on a, 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",  4", and 5" 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 .

HOW TO CONVERT OFFSET TO BACKSPACE 

Zero (0) offset means the dead center of the wheel

Plus (+) offset is  towards the outside (curb side) of the wheel from dead center = (more backspace) . -- And Minus (-) is  towards the backside of the wheel from dead center = (less backspace) .

OFFSET TO BACKSPACE EXAMPLE 

1" inch or 25.4mm plus offset on an 8" inch wheel Converts to approx. 5 1\2" inch backspace ---------- as you will need to include the width of the lip of the wheel ---------

 1" inch or 25.4mm minus offset on an 8" inch wheel Converts to approx. 3 1\2" inch backspace ---------- as you will need to include the width of the lip of the wheel ---------

 

 

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

 

 

 

 

Many racing wheel makers buy their rims from people that make car rims, or farm equipment rims & when your tire falls off you lose the tire, many times the rim, and some times the car, and the race, plus you’re in the pits, & not on the track. That is what takes the fun out of racing. Don't plan on success or pleasure if you use cheap inferior  racing wheels  REMEMBER THE WISE OLD RACER SAYS "YOU MUST FIRST FINISH BEFORE YOU CAN FINISH FIRST"

MRW invented the BeadLocK for circle track racers in 1980 when competition was becoming so fierce that racers were literally tearing the tires off their cars. Since then MRW BEADLocK have become the standard by which other Type BEADLocK are judged

In 1976 M.R.W. Offered the industry's FIRST & ONLY Crash Guaranteed steel wheels. This was not only a commitment concerning our quality, but an opportunity for us to offer value to our customers when an unfortunate crash occurred. In turn it let us view and inspect tens of thousands of crashed wheels over the last 33 years, thrusting MRW ahead of the competition in the area of product improvement. This is all made possible by    YOU, THE  CUSTOMER

At M.R.W. we are so addicted to motorsport wheels, that we make over 10,000 different MOTORSPORT WHEELS

  ? what is motorsports ?

MRW MOTORSPORTS ACCESSORIES

TIRE GRINDER BUFFER DISK TIRE  GROOVERS  AND SIPERS MAGNETIC PAINT MRW DECALS MRW ORDERING INFORMATION
TIRE CHANGING TOOLS TIRE BEAD BREAKER TIRE IRONS WHEEL VALVE STEMS TIRE PRESSURE GAUGES
TIRE SAFETY INFLATOR TIRE STAGGER TAPE LUG NUTS SPORTS APPAREL CHROME CENTER CAPS
CARBIDE GRINDING DISK NAIL BUFFER DISK TRACTION ADVANTAGE WHEEL PARTS BEADLOCK PARTS
ROLL CAGES        

 AGM TOTAL POWER RACING BATTERIES 

CLICK ON LOGO FOR HEADERS

"Click" to see offset page

"Click" to see bolt pattern page

"Click" to see BEAD-Loc install  page

"Click" to see metric imperial bias tire charts 

"Click" to see bolt grade specs. & conversion charts

"Click" to see drill tap metal spec. fractions to decimal charts

 

"Click" to see steel tubing hot roll metal weights and measures charts

 

"Click" to see gear ratio chart

 

"Click" racing tire calibration

 CUSTOMER COMMENTS

 

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|SCHOENFELD HEADERS | 16# OUTLAW  wheels | STAGE II  wheels | STAGE III  wheels | ULTRA STAR  wheels | ECONO STAR  wheels | CHROME wheels | STOCK CAR WHEELS | RALLY WHEELS | ALUMINUM WHEELS | WHEEL PARTS | BEADLocK  OPTIONS | BEADLocK  KITS | BEADLocK  PARTS     BEADLocK  INSTALLATION | CHECK` OFFSET | BOLT PATTERNS | ACCESSORIES  |  HISTORY | HOME |

STICK ON MRW DECALS | MAGNETIC PAINT  | BEAD BREAKER | TRACTION ADVANTAGE LUG NUTS  | CARBIDE DISK  ROLL CAGES | SAFETY INFLATOR  | TIRE IRONS |  | CHROME CENTER CAPS   | TIRE STAGGER  TAPE | LOW PRESSURE GAUGES | VALVE STEMS SPORTS APPAREL | TIRE GROOVER | ROLLCAGE |

index two

 | 16# OUTLAW  wheels | STAGE II  wheels | STAGE III  wheels | ULTRA STAR  wheels | ECONO STAR  wheels |  RACING-BEADLocK - KITS  |RACING-BEADLocK -PARTS   ROCKCRAWLER  BEADLocK KITS  | ROCKCRAWLER  BEADLocK PARTS

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

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

MRW motorsports ACCESSORIES 

COMPLETE RACING WHEELS INDEX PAGE

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