Chumba StellaGeometry & Bikepacking Bag Fit2026
Discontinued. Chumba no longer lists the Stella. It's here because these frames stay in circulation second-hand and the geometry is still what you need to pick bags — but you won't find one new.
What it can carry
Mount provision and clearance, as Chumba publishes it.
- 29 x 2.8" tires (many fit in dropout rear position on size M, L, XL)
Chumba's wording: “Max Tire Clearances: 29 x 2.4” (in all dropout positions); 29 x 2.6” (mid dropout and rearward)); 29 x 2.8" tires (many fit in dropout rear position on size M, L, XL); 27plus x 2.8" (in all dropout positions M, L, XL, mid-rearward on size small). Frame will fit 27+ x 3.0" or 29" x 3.0" on a 45mm rim”
Geometry
All figures in millimeters except angles. Effective top tube and seat tube are the two that decide frame bag fit.
| Size | Eff. top tube | Seat tube | Standover | Head tube | Stack | Reach | Chainstay | Wheelbase | BB drop | Head angle | Seat angle |
|---|---|---|---|---|---|---|---|---|---|---|---|
| SM | 585 | 381 | 730.25 | 90 | 607 | 398 | 435-455 | 1081-1101 | 51.5 | 70° | 73° |
| MD | 605 | 431.8 | 768.35 | 100 | 618 | 416 | 435-455 | 1101-1121 | 51.5 | 70° | 73° |
| LG | 625 | 482.6 | 800.1 | 110 | 626 | 433 | 435-455 | 1120-1140 | 51.5 | 70° | 73° |
| XL | 645 | 533.4 | 850.9 | 120 | 638 | 443 | 435-455 | 1130-1150 | 51.5 | 70.5° | 72.5° |
Bottom bracket height
Roughly 324mm off the ground. Chumbadoesn't publish this directly — we derive it from their BB drop and a typical 75cm tire diameter, so treat it as indicative rather than exact. It changes with the tire you fit. Lower means more stable and more pedal strikes; higher means the opposite.
Source — Chumba's own geometry chart: https://chumbausa.com/stella-steel-mtb-geared-singlespeed-29er-27plus — checked 2026-08-18. A dash means the figure isn't published; we leave it blank rather than estimate.
Note: Manufacturer page labels this as "Stella Steel Mountain Bike (Archived Model)" and says "Frame only, complete and partial builds available." Geometry measurements are with 29er 100mm fork; standover measured 90mm forward of bottom bracket. Seat tube length and standover were published in inches and converted to millimetres. Chumba publishes a stainless internal dropper port on the non-driveside with a rubber housing guide.
Which frame bags fit
Every frame bag we track, checked against this frame's published geometry. Pick your size.
Checking 19 frame bags against a 625mm effective top tube and 482.6mm seat tube. 19 fit.
Read these as conservative. This size has a steeply sloping top tube — the seat tube is only 77% of the effective top tube. Bag makers publish a minimum seat tube length assuming a roughly level top tube, so on a frame like this the comparison understates how much room you actually have. The front triangle here is about 1441 cm², which is the number that actually decides what fits. Several bags marked unlikely below will physically fit. Half-frame bags don't depend on seat tube length at all.
Frame bag fit is calculated from Chumba's published geometry, so it's as reliable as their chart. Seat packs and handlebar rolls depend on your exposed seatpost and bar width, which no geometry table lists — the bag finder covers those once you add your own measurements.