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 Most makers do not publish it, so I assume 10 mm and add 6 mm to the band beside every answer.
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 hands sit than your saddle. On a riser bar I count the bar's rise, so the drop is that much less than it is to the clamp.
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
Ribble CGR SL
Gravel · 5 sizes
The CGR SL on ribblecycles.co.uk
Sign in and add the bike you ride, and this table will say what each size needs for your position.
Sign in
This is the bike I ride
No account is needed to read the table. Report a wrong number · Correct this bike
- Bike
- Ribble CGR SL · Gravel · 5 sizes
- Geometry
- ribblecycles.co.uk, from the Internet Archive's copy of 2021, fetched 22 Oct 2026, re-checked, no differences
- 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 M 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
read off the maker's page: ribblecycles.co.uk, from the Internet Archive's copy of 2021- Tyre clearance
- 700c x 45 mm, 650b x 47 mm
- Bottom bracket
- BSA 68
- Axles and brakes
- 12x100 / 12x142
- UDH
- not published
- Seatpost
- proprietary, supplied with the frameset
- Frame weight
- 1150 g
- In the box
- frame, fork, headset, carbon seatpost, wedge seat clamp, carbon fork expander, thru-axles
- Rider weight limit
- 120 kg
In the maker's words
Kept whole, as I read it off ribblecycles.co.uk, from the Internet Archive's copy of 2021.Ribble builds were configured at order on this page (bike builder): the builds named on the capture ship either a two-piece bar and stem or the LEVEL 5 Carbon Integrated Handlebar System; the geometry table prints no stem length or bar width per size, so the stock fields are null.
Cockpit and seatpost, in the maker's words · 50 words
Ribble builds were configured at order on this page (bike builder): the builds named on the capture ship either a two-piece bar and stem or the LEVEL 5 Carbon Integrated Handlebar System; the geometry table prints no stem length or bar width per size, so the stock fields are null.
OFFICIAL SOURCE, ARCHIVED: Ribble Cycles' own CGR SL model page (carbon cross / gravel / road frame, Toray T800/T1000 monocoque) as the Internet Archive captured it on 2021-06-19. Source: html table (Internet Archive snapshot 2021-06-19)
How I read the maker's table
the page's "Sizing & Geometry" panel is an HTML table, five sizes XS to XL. The model is no longer on Ribble's live site (round 10 found ribblecycles.co.uk answering 403 to fetchers in any case). Rows as printed: A - Seat Angle, B - Top Tube (no effective or horizontal wording; recorded as top_tube_effective), C - Head Angle, D - Offset (fork offset), E - Head Tube, F - BB Drop, G - Seat Tube, RC - Chainstay, FC - Front Centre, Reach, Stack, WB - Wheelbase, plus rider height and wheel size rows (not in the schema). Ribble labels the seat and head angle rows "(mm)"; the cells are degrees. Wheel size is printed as "650b / 700c" on every size: the frame takes either wheel (clearance below); wheel_size records 700c. Model year: Ribble prints none; the capture sells the bike in mid 2021, so 2021. The same table, cell for cell, is on the 2022-02-03 capture (the re-check), and Bike Insights files the same stack, reach and angles under 2019, 2021 and 2022. A later capture (2023-03-30, Ribble's new site) prints the same frame with three cells changed: S top tube 535 (540 here), M top tube 545 (555 here) and M head tube 150 (155 here); the 2023 top tubes close with the printed stack, reach and seat angle and the earlier ones do not (S 375 + 548.5 / tan 74 = 532.3, M 379 + 561 / tan 73.5 = 545.2), so the 2021 S and M top tubes look like a slip Ribble later corrected. Kept as printed here. Frame facts from the same capture's FAQ: 45 mm tyres on 700c (40 mm with full mudguards), 47 mm on 650b; 68 mm BSA threaded shell; 12x100 front and 12x142 rear thru-axles; seatpost specific to the CGR SL, supplied with the frameset; frame 1.15 kg (no size given), fork 450 g; maximum rider weight 120 kg; rack mounts; mudguards need an optional bridge (700c only).