Will the Maxxis Assegai 29×2.50 WT (63-622) fit the rear of a Giant Fathom 29 2 (2022)?

Yes — it fits, on a derived verdict. The tyre's required bead seat matches the bike's wheel size, and the frame's stated maximum tyre width covers the width the tyre asks for. Confirm the clearance with your own eyes before the first ride.

Can I run the Maxxis Welter Weight tube 29×1.75/2.4, Presta 48 mm in it?

Yes — it fits, also derived. The tube's only stated requirement is wheel size, and that matches the bike.

Can you tell me which rear hub or wheelset to buy?

Not yet. The rear axle spacing is not on file, and that is a safety-critical measurement. Until it is verified by two independent sources, the answer is unknown, and unknown is not a quiet yes.

Do I have to go tubeless?

No. The rims are tubeless-ready, which is an invitation rather than a requirement. Tubes are a fair choice, and a spare tube is worth carrying either way.

On the road · On the road

Rear Wheel of the Giant Fathom 29 2: What Bolts On

The bench · September 1, 2026 · 6 min read

I sweep the shop floor and I like knowing why a tyre seats the way it does.

The rear wheel is where a trail bike earns its keep, and it is also where a bad guess costs you a ride. Here is what we hold on file for the rear wheel of the Giant Fathom 29 2 (2022), which of the two Maxxis parts people keep searching for is projected to fit it, and which measurements are simply not in the file yet.

What this rear wheel is, on paper

Every line below was read from a cited manufacturer or standards sheet. Where one publisher states a value, we call it derived. Where two independent publishers agree, we call it verified. No bike in our fleet is fully verified yet, and this one is no exception. That matters most when a part hangs off a safety-critical measurement, and we will say plainly further down where that bites.

Wheel size (ISO bead seat)	700c / 29" (ISO 622)
Maximum tyre width (frame)	63.5 mm
Rim internal width	30 mm
Tubeless-ready rims	Tubeless-ready
Freehub body	Shimano HG, 8/9/10-speed body (also 11/12-speed MTB HG cassettes)
Rear speeds	10 speeds
Chain standard	10-speed (6.0 mm)
Shift actuation	Mechanical (cable)
Brake actuation	Hydraulic disc
Brake pad shape (fitted calipers)	Tektro / TRP 2-piston hydraulic & TRP mechanical (E10.11 pad)

Rear wheel — Giant Fathom 29 2 (2022)

Read that block as a shape rather than a shopping list. A wide internal rim, a tubeless-ready bed, a generous frame clearance, a mechanical drivetrain and hydraulic discs. It is a bike built to take a big, square trail tyre and hold it steady. The rim width in particular is why a wide-cased casing sits well here instead of light-bulbing off a narrow hoop.

The tyre

Maxxis Assegai 29×2.50 WT (63-622) — Maxxis Assegai 29×2.50 WT (63-622)

The Maxxis Assegai 29×2.50 WT (63-622) fits the Giant Fathom 29 2 (2022). The verdict is derived, and it rests on two dimensions lining up: the tyre's required bead seat matches the wheel size the frame and rims are built around, and the frame's stated maximum tyre width is at or above the width this casing asks for. Nothing exotic is happening. The tyre asks for a twenty-nine inch bead and enough room in the stays, and the file says both are present.

Worth saying out loud: a clearance match on paper is a match to the manufacturer's stated maximum, not a promise about your mud, your rim tape build-up or a rear wheel that has taken a knock. Spin the wheel before you ride and look at the chainstay bridge and the seat tube with your eyes. Paper is a starting point, not a substitute for a hand and a torch.

The tube

Maxxis Welter Weight tube 29×1.75/2.4, Presta 48 mm — Maxxis Welter Weight tube 29×1.75/2.4, Presta 48 mm

The Maxxis Welter Weight tube 29×1.75/2.4, Presta 48 mm fits the Giant Fathom 29 2 (2022), also on a derived verdict. The single dimension that carries it is wheel size: the tube is built for the same bead seat diameter the bike runs. That is the only requirement this part states, so that is the only thing the verdict can lean on.

Assegai — Requires: Wheel size (ISO bead seat)	700c / 29" (ISO 622)
Assegai — Requires: Maximum tyre width (frame)	≥ 63 mm
Assegai — Manufacturer part number	ASSEGAI-63-622
Assegai — Brand	Maxxis
Welter Weight tube — Requires: Wheel size (ISO bead seat)	700c / 29" (ISO 622)
Welter Weight tube — Manufacturer part number	WELTER-29-175-240-P48
Welter Weight tube — Brand	Maxxis

How to think about the swap

The rims are tubeless-ready, so you have a choice to make before you buy anything. Tubeless means valves, tape and sealant, and a little patience at the compressor. Tubes mean a spare in the pack and a simpler evening. The tube listed here suits the second path and also lives happily as the emergency spare for the first, because a tubeless tyre that will not reseal on the trail gets a tube stuffed in it and rides home.

Fitting the tyre without drama

Check the room first With the old tyre off, look down the stays and at the seat tube. Compare what you see to the frame's stated maximum tyre width in the table above.
Mind the tape A tubeless bed wants clean, evenly tensioned tape. Old, lumpy tape changes how the bead seats and can leave you chasing a phantom leak.
Seat the bead dry Get the bead to pop all the way round before sealant goes in. A partly seated bead hides under sealant and shows up as a wobble on the first descent.
Spin and look Inflate, spin the wheel, and watch the tread against the frame from behind. Then ride gently before you ride hard.

Unknown is an answer. It is never a quiet yes.
— The bench

What is not on file

We hold a front axle spacing for this bike. We do not hold a rear axle spacing, and we do not hold a rotor size. Both are safety-critical measurements, and both are exactly the sort of thing where a confident wrong answer sends someone home with a hub that will not thread or a rotor the caliper cannot see. So the honest answer for a rear hub, a rear wheelset or a rotor on this frame is unknown, and we will not sell a part into an unknown.

The two verdicts above are derived rather than verified, because a second independent publisher has not yet confirmed the frame and wheel figures they lean on. For a tyre and a tube, where the failure mode is rubbing or a bad fit rather than a part that cannot be secured, we are comfortable calling it. We will say so again when the second source lands.

Giant Fathom 29 2 (2022) — Giant Fathom 29 2 (2022)

Will the Maxxis Assegai 29×2.50 WT (63-622) fit the rear of a Giant Fathom 29 2 (2022)?: Yes — it fits, on a derived verdict. The tyre's required bead seat matches the bike's wheel size, and the frame's stated maximum tyre width covers the width the tyre asks for. Confirm the clearance with your own eyes before the first ride.
Can I run the Maxxis Welter Weight tube 29×1.75/2.4, Presta 48 mm in it?: Yes — it fits, also derived. The tube's only stated requirement is wheel size, and that matches the bike.
Can you tell me which rear hub or wheelset to buy?: Not yet. The rear axle spacing is not on file, and that is a safety-critical measurement. Until it is verified by two independent sources, the answer is unknown, and unknown is not a quiet yes.
Do I have to go tubeless?: No. The rims are tubeless-ready, which is an invitation rather than a requirement. Tubes are a fair choice, and a spare tube is worth carrying either way.

The short version

The Maxxis Assegai 29×2.50 WT (63-622) fits the Giant Fathom 29 2 (2022) — wheel size and frame tyre clearance both match, on a derived verdict.
The Maxxis Welter Weight tube 29×1.75/2.4, Presta 48 mm fits the same bike, carried by wheel size alone.
The rims are tubeless-ready with a wide internal bed, so a wide trail casing sits square rather than light-bulbing.
Rear axle spacing and rotor size are not on file. Those questions stay unknown, and we will not guess them.

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