38 • September 2026 • Powersports Business

Figure 3. Where the service-parts revenue goes, by category. OE( navy) versus aftermarket( orange) share of customer-paid serviceparts revenue. The 11 largest categories by combined revenue, each panel ordered by that segment’ s own revenue; grey is the category’ s share of all service-parts revenue in that segment on a dollar basis.

Figure 4. The OE-to-aftermarket ratio over time, at service. OE( navy) versus aftermarket( orange) share of service-parts revenue, monthly. Both segments swing seasonally, so we compare like quarters on a dollar basis.

and in revenue terms it is concentrated( Figure 3). Tires are the single largest service category in both segments, about 25 % of street service-parts revenue and 22 % offroad, and they are overwhelmingly aftermarket.

At the other end, engine, body, electrical, and oil revenue stays roughly 80 % to 97 % OE. For a supplier, that is a map of where the openings are; for a manufacturer, it is a list of the categories being lost. The calendar changes the ratio because it changes the work( Figure 4). The off season fills the bench with repair and rebuild jobs that run almost entirely OE.

Body work alone climbs from about 7 % of street service-parts revenue in season to 13 % between November and January, at roughly 3 % aftermarket. In season,