Building BMW /2 Wheels

                                                                                    By Lonnie Walker                                                                          

 

        Before We Begin, Let Me Give You A Little Background

 I began building wheels in 1968. Fresh out of High School, I took a job at a local bicycle shop, a Schwinn Cyclery in the Bay Area of California. The owner of the shop showed me the tricks to wheel building that revealed the magic for what it really was, a series of small, simple tasks, that when completed, resulted in a finished, ready to use, spoked wheel.

 In 1968, the Bay Area was still a very diverse place, intermixed with the farm lands were horse racing tracks, dirt bike trails, and one of the United States best Drag Strips, Fremont Drag Strip, later known as Baylands Raceway.

 In those days, any repair facility, regardless of what they were supposed to be, be it bicycle shop, motorcycle shop, auto repair facility etc, was sought out to repair any number of things that had nothing to do with their core business. We were sought out to fix and build wheels.

 Between the farms, race tracks etc, we built a lot of wheels that had nothing to do with bicycles. I excelled at wheel building, and soon the word got around the Bay Area, that there was a kid at the Schwinn shop that could build wheels for just about anything..

 During my time at that bike shop, I built wheels for kids push scooters, antique automobiles, sulkies, farm carts, a couple of Top Fuel dragsters, motorcycles, and of course lots of bicycles.

 I decided to do this page because there didn't seem to be much on the web that really dealt with BMW /2 wheel building. I frequent several Vintage BMW web sites, and there are always lots of people asking lots of questions about building or respokeing their wheels. There is a lot of bad information on the web concerning building BMW /2 wheels. Many of the authors of this information seem to feel that there is some particular secret to building these wheels, that it involves VooDoo, or special chants to get it correct.  I have even seen it written that you just need to keep putting a wheel together, and if it isn't correct, taking it apart until you luck into getting it correct, NOTHING could be further from the truth. A BMW /2 wheel will practically assemble itself. Follow along as I show you how to unlock the secret of the BMW /2 wheel.

 Properly assembled, the crossing spokes of a BMW /2 wheel will miss each other with some clearance to spare. Improperly assembled, the crossing spokes will not only touch each other, they will be forced to bend around each other. This is not only incorrect, it is just hard to assemble that way and will result in a wheel that is not as strong as a properly assembled wheel.

 The BMW /2 wheel uses a straight spoke. The BMW system is much stronger, and will keep adjustment much longer than other bikes that use bent spokes, but, you must pay attention to proper wheel orientation when building the wheel or you will get a wheel that is "built backwards". Once you see how the wheels and hubs are built, you will never have a problem with this again and will be able to build a wheel in about five minutes. If you don't have access to a truing stand, you can still build the wheels and have a shop true them.

 True story, I one time had to show an owner of a BMW shop how to orient the wheels and hubs, he told me he could only get it right about 1/3 of the time....scary huh?                                               

 When you really look at a BMW /2 wheel, (I mean really pay attention), you will notice that there are four distinct rows of mounds with spoke holes drilled in them. Starting at the valve stem hole and looking to the right in the photo below, you will notice that there is a mound with a hole in it that is slightly to one side of the center of the rim, it is labeled "Inner Near Side". This is followed by another mound and hole that is slightly to the other side of the center of the rim, this is labeled, "Inner Far Side". Next is a hole and mound that is well to the same side of center as the first hole that we discussed, it is labeled "Outer Near Side". Finally the hole that is well to the center of the rim on the far side labeled, "Outer far Side".

 Being able to see this pattern is the key to building a BMW /2 wheel.

                                               Click on the photos for a larger view

                                          The Rim Hole Pattern Photo 1

                                         wheel1.jpg.jpg (50340 bytes)                          

 Here is another photo. In this one I drew a line through the centerline of each hole. In the photo, the lines aren't equally spaced, that is because of the angle that the wheel was photographed on.

 

                          The Rim Hole Pattern Photo 2

                                          wheel1a.jpg (52282 bytes)                             

 

  Once you have seen, and can determine the four rows of holes, it is time to move on. Now you need to see the four different rows of holes in the hub.

 

                          The Hubs Four Rows of Holes

                                        wheel1b.jpg (33471 bytes)                                       

                                                   

                             Now let's Start Building a Wheel

 First, start by laying your hub down onto your workbench, brake side down. Next lay your wheel down with the hub in the center, look at the orientation of the spoke holes in the hub, and the wheel.

                                 Below is an example of a rim and hub properly oriented

                                                                   wheel2.jpg.jpg (52155 bytes)                             

 

                                                        Now an example of improper orientation

                                                                    wheel3.jpg.jpg (48500 bytes)

                                 

 Before you begin to spoke up, (lace), a BMW /2 wheel, you need to install the spoke plates onto the spokes. Below is a photo of the spoke plates.

                                                                     Spoke Plates

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                                                     Install them onto the spokes as shown

                          Spoke With Installed Spoke Plate

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                                                                          Let's Get Started

                                                               Inserting the first spoke

 

 The easiest way for the beginner to start, is with the outer row of spokes on the non-brake side. Take a spoke/spoke plate assembly, and insert it into an outer hole in the hub. Slide it all the way in, and insert the threaded end of the spoke into an outer hole in the top side of the rim. Thread a spoke nipple onto the spoke. You will now have an assembly that looks like this.

Note: It has been suggested that Anti-Seize paste need to be used on the spoke threads. I don't think that this is necessary when using stock spokes and nipples. The stock spokes are chromed steel, the nipples chromed brass. I don't however think that the use of Anti-Seize paste would hurt anything. However, if you are using Stainless spokes and nipples, them the use of Anti-Seize paste is essential to prevent thread galling.

 

                                The First Spoke Installed

                                              wheel8.jpg.JPG (48926 bytes)                          

 Now continue to add upper spokes until you have completed the top side of the wheel. Shown below is one of the "Tricks" of wheel building. There will always be three spoke holes between any two "Like" spokes. By that I mean, between an upper and the next upper, or a lower and the next lower on the same side of the hub.

                                                                     wheel9.jpg.JPG (47278 bytes)                                       

 When you are finished with the upper spokes on the first side, your wheel will look like this.

                                                                  

                A Wheel With the First Row of Spokes Installed

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 Now take a spoke/plate assembly and insert it into an inner hole on the top side of the hub. Slide it all the way in, and insert it into an inner hole on the top side of the rim, and thread on a nipple.

                                              You will now have a wheel that looks like this

                                                                           wheel11.jpg.JPG (55058 bytes)

                   A Wheel With the First Inner Spoke Installed

                                               wheel11.jpg.JPG (55058 bytes)

                                                                                                                                                                                           When you are finished installing all of the inner spokes on the top side of the wheel, every other spoke hole in the rim will be filled with a spoke assembly.

                                                                        wheel12.jpg.JPG (47629 bytes)   

                                    

 Finish installing all of the inner spokes on the top side of the wheel. When you are finished, your wheel will look like this.

 A Wheel With All Of The Spokes Installed On The First Side

                                               wheel13.jpg.JPG (51197 bytes)                               

 

 Turn the wheel assembly over, repeat the above instructions to complete the other side of the wheel, and your wheel will look like this.

 

                   A Wheel With All Of Its Spokes Installed

                                                wheel14.jpg.JPG (61518 bytes)                                      

                              Thread all of the nipples onto the spokes as shown in the illustration below.

                                                                         wheel15.jpg.jpg (54410 bytes)                                      

 Shown below are the tools that I use for truing the wheel. The first photo, is a spoke wrench that I made from an old Proto butterfly pin wrench. The second photo is an enlargement of the tip of an old, cheap screwdriver that I have ground to fit into the spoke nipples, and around a protruding spoke.

 

                                           Spoke Wrench

                                   wheel16.jpg.JPG (17005 bytes)                               

 

                                       Modified Screwdriver

                                         wheel16a.JPG (29965 bytes)                                      

 Using the modified screwdriver, screw all of the nipples onto the spokes until the end of the spokes are even with the bottom of the screwdriver slot in the nipples, as shown below.

 

                                     Screwing On The Nipples

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                                               Go This Far

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 At this point, some spokes will be tight, some quite loose. This is normal, spokes do vary in length somewhat, and no rim leaves the factory exactly round.

 Using your modified screwdriver, go around the wheel progressively tightening all spokes until they are all the same tension, this should be quite tight.

 Now it is time to "set" the spokes into the spoke plates. Using a large drift punch and a ball peen hammer, strike the head of each spoke as shown below, don't be timid, you need to make the spoke heads conform to the spoke plates.

 

                                         Setting The Spokes

                                                 wheel19.jpg.JPG (60241 bytes)                                   

 Shown next is the special axle that I made for truing BMW wheels. The older BMWs used tapered roller bearings for their wheel bearings, and this axle, (or a sleeve to fit your bikes axle), is required in order to take up the slack in the bearing system.

 

                                            The Truing Axle

                                           wheel20.jpg.JPG (37604 bytes)                                    

 

                          The Axle Taking Up The Bearing Play

                                                wheel21.jpg.JPG (46525 bytes)                                      

 Next is my truing stand. This is of my own design and manufacture.

 I designed, and made this stand to use either pointers, or a dial indicator. I learned using pointers, I am comfortable using pointers, I show pointers being used. If they are good enough for a 275 MPH race car, they are good enough for our bikes. Feel free to criticize, I really don't care.

 

                                           My Truing Stand

                                                    wheel22.jpg.JPG (42034 bytes)                                                     

                              The Wheel mounted On The Stand

                                                    wheel23.jpg.JPG (68496 bytes)                                    

 The first thing that you need to do is to remove the "Hop", or radial run out from the wheel assembly. Analyze the hop, and determine if it is localized, or if the hub is off center from the rim.

 If the hub is off center, the you need to slightly loosen the spokes that are on the low side, and tighten the spokes that are on the high side. The high side will be the area of the rim that contacts the pointers.

 All spokes affect all areas of wheel true, but the inner spokes will have a greater affect on the hop, and the outer spokes will have a greater affect on the "Swerve", or axial run out. There is nothing that can be done to correct the wheel in the weld area, so just ignore this area and work on the rest of the wheel.

 BMWs specs for run out are unrealistic, try to keep run out in both planes to .020" (.5mm).

 

                                          Removing The "Hop"

                                                   wheel24.jpg.JPG (46598 bytes)                                   

 

                                       Removing The "Swerve"

                                                 wheel25.jpg.JPG (42120 bytes)

                                     

 Before the final truing, you will want to check the wheel offset. Much has been made of this issue, however, almost every /2 wheel will spoke up with the proper offset if the spokes that are used are all of the correct length. This wheel spoked up perfectly, and I didn't do anything special to make that happen.

 Measure the hub to truing stand dimension, and the rim to truing stand dimension. The hub dimension should be 6mm greater that the rim dimension on the brake side of the wheel, or slightly less than 1/4". If you don't have access to a truing stand, or yours is not built in such a way that you can use it to take the measurement, you can use a straight edge and ruler. Simply lay the straight edge across the wheel with it resting on the rim edges, then measure from the bottom of the straight edge to the hub at the indicated location.

 If the offset is too great, slightly loosen all of the spokes on the brake side of the wheel, (make sure that you loosen them all the same amount), then tighten all of the spokes on the hubcap side of the wheel. If the off set is too little, reverse the procedure.

 

                                       Measuring The Offset

                                                   wheel26.jpg.JPG (55804 bytes)

                                                   wheel27.jpg.JPG (55448 bytes)                                     

                                       

 A spoke wrench will be necessary for the final truing. When You are finished truing the wheel, strike each spoke gently on its side with the spoke wrench, if properly tensioned, it should make a musical note. I have been told that it is a high C, but being musically challenged, I will have to take that on face value, I just know what they should sound like. Tighten up any spokes that are loose, and then recheck the trueness of the wheel.

 

                                    Using The Spoke Wrench

                                                wheel28.jpg.JPG (33178 bytes)                                      

 When you are finished truing the wheel, grind off any spoke ends that stick out beyond the spoke nipples, then wrap 4-6 layers of vinyl electrical tape over the spoke nipples in order to protect the inner tube from damage.

  I like electrical tape because it is easier to use, and longer lasting than a rubber rim strip. Some people use duct tape, but that is too hard to remove, and it gets brittle with age.

 

                                          The Wrapped Rim

                                                   wheel29.jpg.JPG (46548 bytes)                                                    

 Now cut out the valve stem hole with an Exacto knife, and you are ready to mount and balance a tire.

 

                                                 Cutting Out The Valve Stem Hole

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                                                                                                       wheel31.jpg.JPG (49668 bytes)                              

                                             

 When finished, a properly built BMW /2 wheel will have clearance between the spokes at the cross.

In the photo below, the knife blade slips easily between the spokes. This photo demonstrates the clearance between the spokes

 

                                             Spoke Clearance  

                                                 wheel32.JPG (46308 bytes) 

                                   

                                                                    Good luck with your wheel building

 I am not responsible for errors, omissions, or a lack of understanding or skill on your part.

E-Mail your comments/suggestions to mailto:lonnie@agwalker.com

                                                                                                                        Some Links

                                                                                   Vintage BMW Motorcycle Owners

                                                                                         Real Estate Staging

                                                                                                                 Real Estate Staging Training

 

Alonzo Walker 2004

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