Holdsworth Helm
Road · 5 sizes
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- Bike
- Holdsworth Helm · Road · 5 sizes
- Geometry
- planetx.co.uk, fetched 22 Oct 2026, re-checked, no differences
- Seat angle convention
- Calculated from Holdsworth's table
- Cockpit
- Generic stem and bar, assumed
- Solved with
- cover 10 mm (assumed), max spacers 40 mm (assumed), stem clamp centre 20 mm (assumed), so every verdict carries ±10 mm at the bar
- Sheet
- 22 October 2026 · 879 bikes, 79 makes, 4,979 sizes in the catalogue
Geometry, every size, from the maker's table
The tinted row is the size drawn beside it. Press a size to draw it.The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The MED drawn to scale from the table, with no build on it. Stack and reach run from the bottom bracket to the top of the head tube; every size is solved from those two. One square is 100 mm.
The maker's cockpit
No stock cockpit I can name, so every size is solved on a generic stem and bar unless you choose one on the sheet.Generic stem and barAssumedNo bar is listed for this frame.
Frame facts
not read off the maker's page yet: planetx.co.uk- Tyre clearance
- not recorded yet
- Bottom bracket
- not recorded yet
- Axles and brakes
- not recorded yet
- UDH
- not recorded yet
- Seatpost
- not recorded yet
- Frame weight
- not recorded yet
In the maker's words
Kept whole, as I read it off planetx.co.uk.Not printed on the sizing page: builds are configured on the product pages (frame build kits and complete bikes), so stock stem and bar are null.
Cockpit and seatpost, in the maker's words · 26 words
Not printed on the sizing page: builds are configured on the product pages (frame build kits and complete bikes), so stock stem and bar are null.
OFFICIAL SOURCE: "Holdsworth Helm Sizing and Geometry" (https://planetx.co.uk/pages/holdsworth-helm-sizing-and-geometry). Source: html table (official sizing page "Holdsworth Helm Sizing and Geometry" on planetx.co.uk, the Holdsworth brand owner's store; fetched 2026-10-22
How I read the maker's table
Planet X (planetx.co.uk) is the retailer that owns and sells the Holdsworth brand; this is the brand's own sizing page on that site, not a third-party listing. The Helm is sold there as "Holdsworth Helm Road Bike / Frame Build Kit". Five sizes XSM, SML, MED, LRG, XLG (labels as printed). The page prints no fork offset, standover, trail, stem or bar (null), and does not say where stack is measured to (stack_datum null); a geometry drawing image sits beside the table and was not needed (the table is HTML). Model year: the page does not date the chart; it is the listing on the fetch date, so model_year is null. Category: road race by its low stack and long reach (MED 543/379); the page gives no category. Bike Insights files the Helm as a 2024 version.
Source: html table (official sizing page "Holdsworth Helm Sizing and Geometry" on planetx.co.uk, the Holdsworth brand owner's store; fetched 2026-10-22, HTTP 200)