MemphisRob Posted December 1, 2017 Share Posted December 1, 2017 (edited) I think it might be helpful to hear what some different tire and wheel combos are producing as our new NASA Tire Section Width. If you share the details on your widths I will update this post to consolidate and create a database. I understand it won't be perfect and it will be on the honor system, so consider that before dropping a bunch of coin. Measured NASA Section Width - Tire Size - Tire Brand - Tire Model - psi - Date Code/Age - Wheel Size - Wheel Brand - Wheel Model - Method of Measurement - 23mm/30mm deep ???.?mm - 225/45/17 - Bridgestone - RE71R - 32psi - 2015 - 17x7.5 - BMW - OEM - digital calipers - 30mm deep From 6.1.2 of the 2018 Rules - https://nasa-assets.s3.amazonaws.com/document/document/12742/ST5_Rules_2018--v1.1--11-29-17.pdf “NASA Section Width” DOT tire width is determined by a measurement of the “NASA Section Width” of the largest tire (if staggered sizes) on the vehicle in post-competition impound/inspection, without changes to tire inflation (may be allowed to cool to pre-competition pressure). The tire may be measured while off or on the vehicle at any location not affected by ground contact sidewall deflection. A tire's NASA Section Width is the measurement of the tire's width from its inner sidewall to its outer sidewall using the NASA Section Width tire measurement tool(s) (excluding any protective ribs, decorations or raised letters) at the point 30mm deep to the tread surface on a new tire for vehicles 2400 lbs. or greater, and 23mm deep to the tread surface for vehicles less than 2400 lbs. I will update this post with new measurements as they come in. If there is a measurement already listed similar to yours please contribute your measurements as well. There will likely be some variances like worn shoulders or wheels that don’t run “true” to size...so the more data points the better. https://www.dropbox.com/s/l4oa9bjm4qvnfbn/Photo%20Dec%2011%2C%206%2012%2038%20PM.png?dl=0 Edited December 12, 2017 by Guest Quote Link to comment Share on other sites More sharing options...
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