The component map: what Zero carried over, and for how long

Every row on this page comes from the specification table printed in a Zero owner manual. A cell under "S, 2019" says: the 2019 S owner manual describes this fork, this caliper, this belt. That is a strong claim and a checkable one, because the manual file and the model year sit beside every entry.

It is also a limited claim. Zero's owner manuals print no part numbers, for the belt, the fork or anything else: the spec sheets give a maker and a dimension and stop there. Two bikes sharing a cell here share a described specification, which is not the same as sharing an assembly. A "Showa 41 mm inverted cartridge fork" on a 2015 S and on a 2023 FXE may differ in spring rate, internals and part number, and nothing in any manual would tell you.

Use this as a map of what the factory specified and where the design breaks fall. For an actual interchange decision, the dealer parts catalogue is the authority, and we do not have one.

The main table is built from Zero's own owner manuals: 90 model-year specification sheets extracted from the manual set, each cell carrying the PDF it was read from. That is a primary source, and it covers the chassis well: suspension, brakes, tyres, belt, wheels and ABS.

It does not cover the high-voltage side at all. We measured this by searching the full text of the 46 manuals in our index for the suppliers who build those parts: Calex appears 0 times, Mean Well 0, Delta-Q 0, Elcon 0. Only Sevcon is named. Zero describes the charger by its kilowatt rating and the battery by its chemistry, and never says who made either.

So the charge path gets a second table, drawn from the rescued zeromanual.com community archive. That is the wiki Zero owners maintained for about a decade; it went offline in 2026 and survives only through the Internet Archive. From it we take identity and nothing else: a manufacturer's name, a hardware identifier, the platform a page is about. We do not republish its prose. Its per-author attribution did not survive the rescue (the Wayback captures hold no page source), and a community wiki is authored work whose contributors deserve credit we cannot give.

The table ranks components by how many model-year sheets specify them. The pattern is consistent: Zero changed frames, packs and badges far more often than it changed the parts a rider wears out.

J-Juan 1-piston 240 x 4.5 mm disc is the extreme case: 77 of the 90 sheets, 9 model lines, 2014–2026, across every hardware generation Zero has built. The rear shock is nearly as durable a choice: Showa 40 mm piston piggy-back reservoir on 9 lines, 2015–2026.

Read the year ranges as ranges with holes, not as unbroken runs. Where a model year is missing from a range, it is missing from the data (see the gaps section). It is not evidence that the bike changed that year and changed back.

25 of 60 components appear on more than one platform. Those are the parts that survived a redesign, and for a used buyer they are the reassuring ones: a component still being specified on a current bike is a component with a supply chain behind it.

The rest mark the breaks. The fork line is the clearest example: Showa 41 mm inverted cartridge runs 2015–2025 across 7 lines and then stops, and the bikes after it take larger separate-function forks that share nothing with it. The belt shows the same shape in three steps. The most widely fitted is Gates Poly Chain HTD Carbon (2017–2026), and the newest is Gates Carbon Drive Moto X9 (2023–2026).

The braking and stability side breaks once, decisively, at the move to stability control: Bosch Gen 9 covers 2015–2025 on 7 lines, and the bikes after it carry Bosch's MSC variants instead.

The components that decide whether a used Zero is a good buy are mostly on the high-voltage side: the onboard charger, the contactor, the DC-DC converter, the controller. Those are also the components Zero's manuals describe without ever naming a supplier.

The community archive names them. It identifies the Gen2 onboard charger as Calex / GreenWattPower hardware and gives its identifiers, identifies the earlier supply as Mean Well, and identifies the Gen2 motor controller as Sevcon Gen4 in two sizes. Across the archive's component pages we can recover 8 hardware identifiers on 6 components.

Treat these as community findings with a citation, not as manufacturer data. Each row links to the archived page it came from and carries the date that page was last edited, so you can see how old the claim is. Several are now five or more years old, and Zero has revised hardware since.

Apart from the controller rating, which has its own paragraph below, 30 cells carry no component. They are published as holes rather than filled by inference, each with one of four reasons, and the four counts below add up to 30.

8 are parts the manual's own specification table does not list. Each was checked against its manual. The 2014 books mention ABS only as the plastic the body panels are made of, and the 2026 XB and XE manuals name no ABS and list no drive belt in their specification tables. Nothing can be done about those from this source.

10 are rows where the manual text names no maker and no model, all of them on the 2026 LS1, XB and XE. The LS1 table, for example, gives its final drive as "104T/22T, belt driven" and says nothing more about the belt.

11 are rows where the manual describes the part only in general terms, with no maker and no size: "Piggy-back reservoir shock with adjustable spring preload, compression and rebound damping". Three different bikes carry that same sentence, and collapsing them into one row would publish "these three share a shock", which nothing supports. They stay empty.

One is a part the manual does name and the second pass below would not publish: the 2016 FXS belt (Gates Poly Chain GT Carbon, by our reading of the manual text). That pass reads a manual without knowing which model each table belongs to, and no neighbouring year of the same model line carries that part, so it refuses it and the cell stays empty.

The controller rating is kept out of those 30. 55 model-year sheets show no controller rating here, and 50 of them come from a manual that does print one in a Controller row of its own. The second pass publishes such a rating only when a neighbouring year of the same model line already carries it from the specification sheet, and for these none does.

16 components are described precisely enough to identify but carry no manufacturer at all. Eight are on the 2014 bikes, whose manuals give fork diameters and tyre sizes without naming the fork or tyre maker. Four are controller ratings, because the controller row gives the current and no maker. The other four are on the 2026 XB and XE. All of them are shown with the measurement and no maker, which is exactly what the manual says.

Some holes are our own error. The FX and FXS year ranges used to break at 2016 in three categories at once, and an earlier version of this page explained that break by saying the 2016 manual stated those rows generically. That explanation was wrong. Page 122 of the 2016 FX/FXS owner manual prints, in full, "Front Suspension Showa 41 mm inverted cartridge forks" and "Rear Suspension Showa 40 mm piston, piggy-back reservoir shock". The manual was precise and our extraction of it was not. The extraction failed by writing a vague sentence instead of leaving the field empty, which is how a silent miss came to be published with an invented cause beside it.

So the build now makes a second pass, reading the manual's own indexed text for the fork, shock, brake, ABS, belt and controller rows wherever the specification sheet gave nothing usable. 47 cells came back that way, 9 of them on the 2016 FX and FXS. Every recovered cell names the PDF page it was read from.

The second pass is deliberately hard to satisfy. The specification table is printed in two columns and the text extraction interleaves them, so a value routinely arrives split around an intruding row. A single manual can also cover several models (the FX/FXS book prints both bikes' tables), so an occurrence cannot be assigned to a model by where it sits. A naive read produced real errors when we checked it against the sheets we already trusted: an FXS front brake came back as the FX's smaller disc. So a recovered value must clear two bars. At least two occurrences in that manual must decode to the same component, and the same model line must already carry that component in a year within two of the gap. Where one manual prints two different parts in the same row, as the 2021 S and SR tables do with a 550 A and a 775 A controller, both are kept as candidates and the second bar decides between them. The second bar is the one a model-blind manual cannot clear for itself, and it is conservative by construction: it can confirm that a part the bike already had was still fitted, and it can never mint a component from nothing. 6 candidates were refused by it and stay holes.