SPI Tunnel Protector

A snowmobile tunnel takes a beating. Ice chunks, slush, and the spinning lugs of the track constantly throw abrasive debris at the underside and sides of the tunnel, and the problem gets worse once you add studs or traction products. SPI (Sports Parts Inc.) makes tunnel protectors that give riders a replaceable barrier between the track and the tunnel, so the sled's structure stays intact season after season.

UHMW Wear Strips for Everyday Protection

Much of SPI's tunnel protector range is cut from UHMW (ultra-high-molecular-weight polyethylene), a slick, abrasion-resistant plastic widely used for wear strips. The strips are sold as black, ride-specific lengths, so you can match the protector to your sled and track rather than trimming a generic part. Examples from the lineup include a roughly 58-3/4 inch strip made for 2019-2021 Polaris Indy models with a 129-inch track, and other Polaris-specific lengths for Titan and Indy applications. For Ski-Doo owners, SPI offers strips such as a 1 inch by 50 inch protector that replaces a taller OEM-style strip, along with a universal 43 inch by 3/4 inch UHMW option.

Aluminum Tunnel Protector Kits for Studded Tracks

When you run a heavily studded or aggressively lugged track, a plastic strip alone may not be enough. SPI's aluminum tunnel protector kits are designed for exactly that situation, and they are recommended whenever traction products are added to the track. The kits are made for late-model Polaris Indy sleds with a 129-inch track and ship as a pair of protectors with the mounting hardware, including flat head bolts, flange nuts, and rivets, plus an instruction sheet. Some applications use a longer aluminum design of about 54-1/2 inches in length. If you are weighing materials, aluminum offers a more rigid shield against stud strikes, while UHMW is lighter, easier to cut and fit, and glides smoothly against the track.

Choosing the Right SPI Protector

• Match the sled and model year: SPI sizes its protectors by platform, so confirm that the length and mounting style suit your chassis and track length.
• Consider your track setup: Studs, carbides, and aggressive lugs call for the sturdier aluminum kits, while stock-style tracks are well served by UHMW.
• Check the included hardware: Aluminum kits come with their own fasteners, whereas simple UHMW strips are typically sold as the strip alone.
• Inspect regularly: A protector is a wear item. Replace it once it is thinned or damaged so the tunnel itself never takes the hit.

Why SPI in This Category

SPI's broader catalog is built around aftermarket parts engineered to interchange with original components, and the tunnel protector line follows that approach with fitment tied to specific Polaris and Ski-Doo models. That gives riders a practical way to protect a tunnel without paying for dealer-only parts. To see how these protectors compare with other makers, browse the full Tunnel Protector category, or explore everything the manufacturer offers on the SPI brand page.