Stack and reach
How high and how far forward the top of the head tube is, from the bottom bracket. They are the two numbers that decide whether a frame can be set up like yours.
BB, or bottom bracket
The axle your cranks turn on, in the middle of the frame. Every number on this site is measured from it, because it is the one point that sits in the same place on every bike.
Headset cover
The little cap on top of the head tube, under your spacers. Most makers do not publish it, so I assume 15 mm and add 6 mm to the band, which on its own is enough to hold an answer at "probably" rather than "fits".
Stem clamp, and its centre
The collar on the steerer that your stem bolts to. I need the middle of it. Where a maker gives only the height, I assume halfway up and say so on the answer.
Steerer
The tube coming up out of the fork. The cover, the spacers and the stem all sit on it, and it is the thing a mechanic cuts to length.
Bar reach
How far forward the hoods sit from the middle of the bar. Two bars on the same stem can put your hands 20 mm apart, which is why I ask.
Setback
How far your saddle sits behind the bottom bracket.
Drop
How much lower your bar is than your saddle.
Rails, and the rail centre
The two rods under your saddle, and the middle of the straight part of them. That midpoint is the point I use, because it is the one you can find with a tape.
The band
How far out I could be, in millimetres, and why. It is a straight sum of everything I had to assume rather than a clever average, so it errs wide on purpose.
wb, stand, trail
Wheelbase, standover and trail: how long the bike is, how high the top tube is where you straddle it, and how steady the steering feels. I show them against your bike, and I leave them out when the maker does not publish them.
est.
Estimated: a number I worked out rather than read off the maker's table. Anything marked this way can move if the maker publishes the real one.
Close Escape closes it. The measuring guide has the pictures. Open the measuring guide
Elves Eglath ARX
Endurance road · 5 sizes
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This is the bike I ride
No account is needed to read the table. Report a wrong number · Correct this bike
- Bike
- Elves Eglath ARX · Endurance road · 5 sizes · integrated cockpit
- Geometry
- store.elvesbike.com, fetched 29 Aug 2026, re-checked, no differences
- Cockpit
- Generic stem and bar, assumed
- Solved with
- cover 15 mm (assumed), max spacers 40 mm (assumed), stem clamp centre 20 mm (assumed), so every verdict carries ±10 mm at the bar
- Sheet
- 6 September 2026 · 210 bikes, 43 makes, 1,262 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 52 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.
In the maker's words
Kept whole, as I read it off store.elvesbike.com.Elves sells the frameset (frame, fork, seatpost, headset, three 10 mm integrated-handlebar spacers, cable-routing adapter for a regular stem, T47 bottom bracket of the buyer's choice) without a bar; the matching one-piece bar is the OROME AeroEvo integrated handlebar, sold separately or bundled, in widths 360/380/400/420 mm and stem lengths 90/100/110/120/130 mm (the Avari page: "360/380/400/420mm Widths, With Stem Lengths Covering 90/100/110/120/130mm"); its stem angle, reach, drop and stack height are not published on the frame pages.
Cockpit and seatpost, in the maker's words · 229 words
Elves sells the frameset (frame, fork, seatpost, headset, three 10 mm integrated-handlebar spacers, cable-routing adapter for a regular stem, T47 bottom bracket of the buyer's choice) without a bar; the matching one-piece bar is the OROME AeroEvo integrated handlebar, sold separately or bundled, in widths 360/380/400/420 mm and stem lengths 90/100/110/120/130 mm (the Avari page: "360/380/400/420mm Widths, With Stem Lengths Covering 90/100/110/120/130mm"); its stem angle, reach, drop and stack height are not published on the frame pages. Headset top-cover height and maximum spacer stack are not published (three 10 mm spacers are supplied). stock_stem_length / stock_bar_width null. Eglath ARX spec sheet image on the page (2026011417143157767.jpg): frame Toray T800 + T1000, integrated seat clamp, headset bearings 1-1/2 in x 7 mm lower and upper, flat mount, T47 threaded bottom bracket, Di2 and eTap compatible, EPS + latex bladder moulding, full internal routing, 12x142 rear, max tyre 700x32C; fork 380 g, offset 45 mm, steerer 300 mm; seatpost 400 mm, 12 mm (standard) or 25 mm offset, 190 g with metal parts, 7x7 and 7x10 clamps; frame weights 46: 980 / 49: 1010 / 52: 1040 / 55: 1070 / 58: 1100 g unpainted without metal parts; accessories include the "Elves Falath ARX headset", three 10 mm integrated-handlebar spacers, cable-routing adapter spacer, Di2 battery mount, internal housing damper. Store option "Handlebars: OROME AeroEvo Compatible - Handlebars must be purchased separately".
SOURCE: the maker's own store page, Description tab, one geometry image (drawing plus two tables, 4378x5315, sharp) and no HTML table. Source: image_table (maker's own ueeshop store; the Description tab embeds one image "EGLATH ARX GEOMETRY" combining the line drawing and two stacked tables
How I read the maker's table
every number was read from the image by the collector. Trail not published (null). A size-guide image on the page repeats standover 694/727/760/792/823 mm with rider heights 150-160 / 158-168 / 166-176 / 174-184 / 182-192 cm. ODDITIES AS PRINTED, kept and flagged: the seat angle is 73 deg on every size; the head angle jumps from 71.4 (49) to 73.1 (52) and front centre and wheelbase FALL from the 49 (587 / 992) to the 52 (583 / 987) while stack and reach rise - i.e. the two small sizes have a slacker front end; BB drop 75/75/73/73/70. Consistency check (mine, not published): sqrt(FC^2 - BB^2) + sqrt(RC^2 - BB^2) reproduces WB within 0.5 mm on every size (46: 572.1 + 408.2 = 980.3 vs 981; 52: 578.2 + 408.5 = 986.7 vs 987; 58: 599.9 + 409.1 = 1009.0 vs 1008), so the printed front centres and wheelbases agree with each other, including the drop at 52. MODEL YEAR: 2026 (the page: "New for 2026, the Eglath ARX, now available"; images uploaded 2026-01). Category endurance road (the maker: "Eglath ARX - (Endurance), One Bike, All Roads"; page title "Endurance Carbon Road Disc Frame, All-Road"; 32C max tyre). No aggregator consulted.
Source: image_table (maker's own ueeshop store; the Description tab embeds one image "EGLATH ARX GEOMETRY" combining the line drawing and two stacked tables, https://ueeshop.ly200-cdn.com/u_file/UPAU/UPAU610/2601/15/photo/20251121100850.jpg (4378x5315); numbers read from the image by the collector, image NOT stored)
