How to Size Trucks for a Longboard? | Match Axle Width

The right truck width for a longboard comes down to one measurement: the axle width versus the deck’s width. Most guides recommend matching these as closely as possible, with 150 mm trucks for narrower cruising and carving boards and 180 mm trucks for standard all-around longboards and downhill riding. Getting this match right affects stability, turning, and whether your wheels bite the deck.

The Core Rule: Match Axle Width to Deck Width

Truck sizing for longboards starts with the deck, not the other way around. Measure the width of the board at its widest point, then choose a truck whose axle width lands as close to that number as possible. Several buying guides suggest staying within 1/4 inch of the deck width for the best balance of stability and turn response.

The key measurement is the axle width — the distance between the two wheel mounting points — not the hanger width or the nominal “truck size” printed on the box. Brands label their trucks differently, so checking the product’s geometry table or axle specification is the safest move before buying.

150 mm vs. 180 mm: Which Width Fits Your Board?

Two widths dominate the longboard market: 150 mm and 180 mm. The right pick depends on your deck’s width and how you ride. A simple breakpoint used by many sources: decks under 9 inches wide pair naturally with 150 mm trucks, while decks 9 inches and wider call for 180 mm or equivalent wider options.

150 mm trucks suit narrower setups built for carving, cruising, slalom, and freeride-oriented boards. They turn more quickly and feel livelier underfoot, but they give up some stability at speed.

180 mm trucks are the most common choice for standard longboards between 36 and 45 inches, especially for all-around riding. They also anchor downhill and freeride disciplines where stability at speed matters most. The trade-off: wider trucks reduce turning responsiveness, so quick carves take more effort.

If you are shopping for a drop-through deck and want to know which trucks pair well with that style, our tested roundup of the best drop through longboards covers complete setups that ride low and stable.

Step-by-Step Sizing Process

Follow this order to land on the right truck width the first time:

1. Measure the deck width at its widest point across the board.
2. Compare against axle width — aim for a match within 1/4 inch, with the axle sitting close to flush with the deck edges.
3. Pick 150 mm for narrower cruising and carving boards; pick 180 mm for most longboards and faster disciplines.
4. Mount and test for wheel bite — push down on the deck over the wheels to confirm they don’t catch the board when turning.

After mounting, check clearance again if you change wheels, add risers, or swap bushings. Each of those parts changes how much room the wheels have under the deck, and truck width interacts with all of them. Tactics’ guide on choosing longboard trucks walks through the geometry in more detail.

One common mistake is treating longboard sizing like street skateboard sizing. Longboards consistently use wider trucks than standard street decks, so the same rules do not transfer. Another frequent error: ignoring deck width entirely and assuming all longboards take the same truck size. The correct width still depends on the specific board.

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