Spank Industries Rims and Custom Wheel Build Requirements for Radially Compliant Rims
Radially Compliant Rim Designs, such as Spank Industries Spank 350, Spank 350 Vibrocore, Spank 359, and Spank 359 Vibrocore rim models, must be built to A-Level specifications, and only by a qualified wheel builder/technician.
External Nipple Washers should be used on all Spank 350 and Spank 359 rim wheel builds. Spank highly recommends the use of nipple washers to improve spoke tension longevity in Radially Compliant wheels.
Spank 350 Vibrocore and 359 Vibrocore rims produced May 2019 or later, include embedded nipple washers. Spank 350 Vibrocore and 359 Vibrocore rims produced before May 2019, do not include embedded nipple washers. If nipple washers are used, it is important to first ensure the nipple access holes are completely free of Vibrocore, and no Vibrocore or residue exists between rim and nipple washer.
Spokes used in Radially Compliant Wheel builds, must be high quality, with high fatigue life, and break point over 300 kg. Single Butted/Plain Gauge spokes are not sufficient for radial compliant wheels. Spank recommends Triple Butted Spokes, of 2.2/1.8/2.0 mm thickness.
Nipples used in Radially Compliant Wheel builds, must be flat head, external type nipples. Internal Nipples, or DSN/Square Drive nipples are not suitable.
3 Cross Lacing must be used on all Radially Compliant rim wheel builds.
350 Vibrocore and 359 Vibrocore rims, should be checked carefully to ensure no Vibrocore or residue exists between nipple head and rim. If any traces of Vibrocore or residue are present, they should be scraped away before nipples are inserted into the rim for building.
Spoke Tension on the drive-side spokes of Radially Compliant rim wheel builds, is recommended at 120-140 kgf.
- Spoke tension throughout drive side spokes should not vary more than 5% maximum.
- Spoke tension throughout non-drive side spokes should not vary more than 5% maximum.
Nipple Lubricant must be used between nipple head and rim interface. Lubricant must not be used on thread of spoke or nipple.
Light to Medium Thread Lock, which allows for tension adjustments without compromising function, (example: LOCTITE® THREADLOCKER BLUE 242®), must be applied on thread of spoke or nipple, before tensioning. A suitable environmentally conscious alternative to industrial thread lock agents, is boiled linseed oil.
Roundness Tolerance requirement for Radially Compliant rim wheel builds is 0.4mm deviation maximum.
Flatness Tolerance requirement for Radially Compliant rim wheel builds is 0.3mm deviation maximum.
Dish Tolerance requirement for Radially Compliant rim wheel builds is 0.4mm deviation maximum.
Maintenance Requirements – Radially Compliant Wheels should be checked for spoke tension stability/loosening, after your first few rides, and regularly for the life of the wheelset (depending on frequency and severity of use).
What spoke length do I need for my customer wheel build with Spank Industries rims?
If you are using Spank rims and Spank hubs, then please refer to the PDF at this link, for a complete list of Spank hand built wheelset spoke and nipple specifications.
Spoke length is calculated with dimensions from your rims (ERD), hubs and nipples, as well as desired spoke lacing pattern. So, you will need all this information to accurately calculate the spoke length you'll need in a custom wheelset.
If you are using Spank rims, and hubs from another supplier, unfortunately, we cannot offer spoke length calculations. As hub models, dimensions, and standards change often, there is too much risk for error, which could lead to you purchasing the wrong length spokes. There are a number of reputable spoke length calculators on-line, which are easy and convenient to use, if you have all the necessary data.
ERD and “++” – It’s important to note that the “++” callout in Spank published ERD measurements for all our rims, refers to the height of the nipples you are using in your wheel build. You must add 2X nipple head height (specific to the nipples you have chosen), to the ERD when calculating spoke lengths. In the past ERD was usually communicated as a calculation including a standard nipple head height, (Inner Diameter of the Rim + 2x Spoke Bed Wall thickness + 2x Nipple Head Height = ERD). However, in recent years many new standards of nipples have been introduced, and nipple head heights vary. For example, a standard external nipple has a 2mm head, while a DSN type nipple has a 4mm head. For this reason, Spank communicates ERD without including nipple head height, so the user can add the exact height of the nipples they have chosen for their build, (Inner Diameter of the Rim + 2X Spoke Bed Wall Thickness = ERD ++).