Issue link: http://read.dmtmag.com/i/41477
Appendix TRUCK TIRE BRANDING 1. The following limits apply when branding MICHELIN® truck tires using equipment without accurate temperature control or which may exceed 465 degrees fahrenheit (240°C). (Hand held equipment is typically used for this "HOT BRANDING.") a. Brand Temperature 570°F (300°C) 480°F (250°C) Maximum Depth 1⁄64 inch (0.4 mm) 1⁄32 inch (0.8 mm) b. Only brand in the "BRAND TIRE HERE" area. 2. For equipment capable of "COLD BRANDING" i.e. controlled temperatures below 465°F (240°C), the following restrictions apply: a. Temperature b. Contact pressure c. Time of contact d. Character Height e. Character Depth f. Location: Circumferentially Radially Maximum 465°F (240°C) Maximum 100 psi Maximum 1 Minute Maximum 1 Inch Maximum 0.040 Inch (1.0 mm) — in the "BRAND TIRE HERE" area, or centered above it. — in the "BRAND TIRE HERE" area with no portion of any character extending more than 1" above the outline of the area. TREAD DEPTH MEASUREMENT ON TIRES RETREADED WITH THE MRT XDU® S PRE-MOLD™ The MRT XDU® S Pre-Mold™ Retread has a lug design optimized for high scrub, high traction operations as well as 32⁄32nds original tread depth. The tread design incorporates bridges between the lugs in order to stabilize the lugs. See photo below. Care must be taken when taking tread depth measurements in order to get an accurate determination of the remaining tread depth. Do not take measurements on top of the bridges! This will give a false reading and may lead to the tire being pulled from service earlier than necessary. There may be as much as 4⁄32nds difference in the measurements taken on top of the bridge as opposed to taking it at the bottom of the groove. RETREAD Bridges FMVSS -119 Section (c) and The Federal Motor Carrier Safety Regulation Part 393.75 state that (non – steer axle) "tires shall have a tread groove pattern depth of at least 2⁄32nds of an inch when measured in a major tread groove. The measurement shall not be made where tie bars, humps or fillets are located." 97