Go crouch beside your Model Y's driver door. The paint between the front wheel and the door is where chips start, not the hood. Front tires pick up gravel and salt and throw it into that strip at whatever speed you happen to be doing. A mud flap is a molded panel behind the wheel that catches the spray before it reaches the rocker panel. Cheap part, annoying thing to fix later. Below: what mud flaps do, what to check on a Juniper, and when they aren't worth it, from the 3W team that builds custom-fit protection for more than 500 vehicle models([1]).
What a Mud Flap Actually Does
A mud flap blocks spray, and that's the whole mechanism. A spinning tire picks up whatever is lying on the road and flings it backward and upward, which is why the dirtiest paint on any car sits behind the front tires. A flap parks in that path and takes the hits.
The reason a mud flap is worth the money isn't the chip itself, it's what comes after. Paint breaks, then primer, then you've got bare metal holding water and road salt all winter. Nobody notices year one. By year three the chips behind the front wheels have run together into a dotted line, and that's bodywork rather than touch-up paint.
Road Debris Isn't a Small Problem
We'd put mud flaps in the safety column as much as the cosmetic one, and the AAA Foundation numbers are why. Their researchers went through four years of crash data and found north of 200,000 crashes involving road debris, which worked out to roughly 39,000 injuries and more than 500 deaths between 2011 and 2014. The part that sticks with us: about two-thirds of those crashes came from something that fell off a vehicle, so most of it was preventable([2]).
A mud flap won't help with a rock already sitting in the lane. What it changes is what your tires throw at the car behind you. Ever followed a pickup across fresh gravel and backed off two car lengths? That's the reason.
No-Drill Mounting, and Why It Matters on a Tesla
Here's what a drilled install does. The installer makes fresh holes through the fender liner or, worse, the body, and runs hardware through them. The problem isn't the hole exactly, it's the edge of it, since the coating protecting that metal has been cut open and left to deal with winter on its own. A no-drill mud flap skips all of that by hanging off hardware already in the car when it left the factory, usually clips along the fender liner, sometimes bolt points behind the arch.
On a Juniper we'd add a second argument for no-drill, and it's an aesthetic one. Tesla builds these with tight panel gaps and a smooth lower body, so a bracket poking out past the arch gets noticed from across a parking lot. You want the flap to look like it shipped with the car. Factory mounting also means the whole thing unbolts before a trade-in and leaves nothing behind but the clips that were always there.
What Changed on the Juniper
Tesla reworked the bumpers on the Juniper, and the car came out about 1.5 inches longer as a result. New 19- and 20-inch wheel designs arrived with it, the 2026 Standard rides on 18s, and underneath there's a revised rear diffuser plus reworked underbody aero and a retuned suspension([3]). Most of that has nothing to do with mud flaps. The bumper and wheel changes do, though, because they sit right where a flap mounts and where it needs clearance. We'd treat any set cut for a 2020 to 2023 Model Y as unproven on a Juniper until somebody confirms it, and buy whatever is listed specifically for the refreshed car.
Wheel Size Changes the Math
Wheel size quietly changes this math. A 20-inch wheel with a short sidewall and a 19-inch wheel with more rubber fill the same arch differently, so both the spray pattern and the room a mud flap has to sit in move with them([3]). Plenty of Model Y owners also run winter tires on smaller wheels, which shifts that geometry twice a year. Buy for the biggest wheel the car ever wears, and check it against what's on the car in January.
Why EV Crossovers Show This More
Here's something gas-car owners never deal with: in an EV you hear every rock. No engine noise covers it, so gravel hitting the underbody shows up in the cabin as sharp little ticks. EVs also run flat panels underneath for aerodynamics, and the Juniper's reworked underbody aero is part of that([3]). Those panels are there for airflow, not armor. A mud flap keeps some of that material from getting under the car at all.
Material: What Holds Up Outside
Nothing on a car lives in a worse spot than a mud flap, so material is the durability conversation. Cheap plastic goes brittle in the cold and snaps the first time it catches a snowbank, while a flexible compound bends and springs back. TPE, or thermoplastic elastomer, is what 3W uses across its liner products, and The Drive reports those liners are rated from -4°F to 167°F and are 100% recyclable with a lifetime warranty([4]). 3W's Thorex TPE is odorless and GRS certified with more than 50% recycled content([5]), GRS being the Global Recycled Standard for recycled content. Staying flexible when it's cold is the spec that matters.
What Good Fitment Looks Like
A good mud flap traces the wheel arch with an even gap, sits flat against the liner without bowing, and doesn't stick out past the body line. 3W builds its vehicle-specific parts from 3D scans using an injection-molded process it calls VigorMold, which gives sharper edges and more even thickness than suction-molded parts([1]), and makes exterior pieces beyond liners, like the running boards shown at the 60th Easter Jeep Safari in Moab([6]). If it looks factory, nobody notices it. That's the goal.
Care, Which Is Mostly Just Rinsing
Just one thing, rinse behind the wheels when you wash the car. A mud flap works by collecting what would otherwise hit paint, and salt sitting against anything all winter is still salt. 3W says the same of its TPE mats, which rinse clean of sand, mud, and dust([6]). Check the hardware once a season too, especially after a winter of snowbanks.
When Mud Flaps Aren't the Right Choice
A mud flap isn't right for every Juniper. If the car lives on clean pavement in a dry climate and sleeps in a garage, there isn't much to protect, and some owners dislike what flaps do to the lower body line. Lowered cars are the real problem case, since less clearance means a flap catches driveways and speed bumps. And a mud flap only protects what it covers: hood and bumper chips come from oncoming traffic, which is a job for paint protection film.
Who Actually Needs Them
If you live where they salt the roads, go buy mud flaps. Brine is the worst thing that happens to a lower body panel, and it lands exactly where a flap sits.
Next tier for mud flaps: gravel driveways, that one construction detour you've been taking since spring, and anybody racking up highway miles. Speed is really the variable here. Speed matters more than road quality here. A pebble that just rattles off the car at neighborhood speeds hits hard enough at 70 to take paint with it, so a daily freeway run will chew up lower panels while a car that mostly crawls through traffic stays fine for years.
The last group is the one that waits too long. Nobody buys mud flaps while thinking about resale, and then three or four years later the car gets photographed for a listing and the side shots show a lower body full of chips. Those photos are what a buyer scrolls through before they ever see the car.
Frequently Asked Questions
Do mud flaps actually prevent rock chips?
Yes, across the area behind each wheel. Debris that the tire would have thrown at your rocker panel hits the mud flap instead.
What does no-drill mounting mean?
No holes get made. The mud flap uses fender liner clips or bolt points that were already behind the wheel arch when the car was built.
Will pre-refresh Model Y flaps fit a Juniper?
Probably not. The refresh changed bumpers, overall length, wheel designs, and underbody aero, and any of those can move a mud flap's mounting points([3]).
Do mud flaps hurt EV range?
A little, in theory. Any surface in the airflow costs something, but a well-shaped mud flap matters far less than which wheels and tires you run([3]).
What material should mud flaps be?
Something still flexible when it's 10 degrees out, which rules out hard plastic for a mud flap. 3W's TPE liner products are rated from -4°F to 167°F, the range an exterior part has to survive([4]).
Do mud flaps need maintenance?
Basically none. Rinse behind the wheels at the car wash so salt isn't sitting against the mud flap, and glance at the hardware once a season([6]).
Does 3W make mud flaps for the Model Y Juniper?
Not yet on the US site. A Juniper no-drill mud flap set is planned, and 3W already sells custom-fit floor mats, cargo liners, and other Model Y protection([5][1]).
References
[1] PR Newswire: 3W Auto-life Marks 10 Years of Crafting Premium Floor Mats for Vehicles: prnewswire.com/news-releases/3w-auto-life-marks-10-years-of-crafting-premium-floor-mats-for-vehicles-with-celebratory-deals-contests-and-a-durability-challenge-302550495.html
[2] AAA Newsroom: American Drivers Aren't Securing Their Loads, AAA Foundation Road Debris Study: newsroom.aaa.com/2016/08/american-drivers-arent-securing-loads-road
[3] Recharged: Tesla Model Y Juniper Refresh Changes Explained: recharged.com/articles/tesla-model-y-juniper-refresh-changes
[4] The Drive: Armor Your Interior and Save 30% on Indestructible 3W Liners: thedrive.com/news/armor-your-interior-and-save-30-on-indestructible-3w-liners
[5] Barchart: 3W Custom Floor Mats Review: barchart.com/story/news/3120419/3w-custom-floor-mats-review-july-2026
[6] PR Newswire: 3W Auto-Life Floor Mats Take on Moab's Famous Red Dust with First Easter Jeep Safari Showcase: prnewswire.com/news-releases/3w-auto-life-floor-mats-take-on-moabs-famous-red-dust-with-first-easter-jeep-safari-showcase-302724969.html
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