ISO 4210-7:2023 sets the static wheel strength test force in its table 1: 370 N for mountain bikes and 250 N for city and trekking, young adult and road bikes, 48 % less. The force is perpendicular to the wheel plane, and on the rear it's applied from the cassette side. The test measures permanent deformation, not elastic deflection: the rim position is recorded, load is held one minute, released, left to settle another minute, then measured again.
It's the standard that decides whether a wheel passes, and almost nobody has opened it.
Table 1 of the standard sets two forces for the wheel static strength test: 370 N and 250 N, applied perpendicular to the wheel plane. On the rear wheel, the load goes in from the cassette side, not the opposite one.
What gets recorded isn't how far the rim moves under load, it's how far it stays displaced once the load comes off. The procedure marks the rim position, loads for one minute, unloads, lets it settle another minute, then measures again. That's permanent deformation, not the elastic deflection you'd see while the force is still on.
The standard recognizes four bicycle types: city and trekking, young adult, mountain and road. Three of the four share the 250 N figure; only mountain climbs to 370 N.
370 against 250 N is 48 % more, our own calculation on the two published numbers. The standard doesn't explain the jump in the text we've read; the figure is in the table, not the reasoning.
Part 7 runs 10 pages, edited by committee ISO/TC 149/SC 1, edition 2, January 2023. We've read it cover to cover and it doesn't contain a single millimeter value: no runout, no tolerance, nothing you'd check with calipers.
The only piece of the standard's own text we reproduce is its scope, which ISO publishes openly in its catalogue: it specifies wheel and rim test methods for ISO 4210-2. The thresholds — the displacement that decides pass or fail — live in ISO 4210-2:2023, a paid standard we haven't read. We can't say what it states, only that it exists and covers that ground.
The four types the standard recognizes don't include downhill or BMX: zero occurrences of either word in the document. Look there for a downhill wheel test and you won't find one.
That doesn't mean those bikes go untested under any standard, it means this particular one doesn't name them. For downhill and BMX you have to look elsewhere, not in 4210-7.
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370 N, per table 1 of the standard.
250 N, for city and trekking, young adult and road: 48 % less than mountain, our own calculation on the two published figures.
Perpendicular to the wheel plane; on the rear wheel, from the cassette side.
No. Part 7's 10 pages don't contain a single millimeter value. The threshold lives in ISO 4210-2:2023, which is paid and we haven't read it.
No. Those words don't appear once in the document; the standard recognizes four types: city and trekking, young adult, mountain and road.
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