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Baby back ribs · 2.9 lb / 1.3 kg · Kettle with snake

Baby back ribs on a kettle in two and a half hours

A 1.3 kg baby back rack cooked at 135°C over apple on a two-zone kettle, no wrap, no spritz, sauced in the last ten minutes. The fastest rib cook on this ledger and the one most likely to be repeated on a weeknight.

  • Cook date7 Sep 2026
  • Published11 Sep 2026
  • Raw weight2.9 lb / 1.3 kg
  • WoodApple
  • CookerKettle with snake

By The Smokehouse Desk

Thermal map for this Baby back ribs cook, with the pit and internal traces stroked over it
Heat zones mapped from pit temperature; white line = internal, red line = pit, crosses = probe samples

Cook timeline

  1. 16:00 Rack on, bone side down, over the unlit side One chimney of lit charcoal on one half of the grate, nothing on the other Pit135°C Internal7°C +0m
  2. 16:25 Rotated end to end At 135°C the end nearest the coals runs 10°C ahead in twenty-five minutes Pit136°C Internal41°C +25m
  3. 16:55 First bend test Rigid; the meat has not started to pull back from the bone ends Pit135°C Internal62°C +55m
  4. 17:30 Second bend test; rotated again Bones showing 4 mm of pull-back Pit135°C Internal76°C +1h30
  5. 18:05 Checked every 8 minutes now 85°C to 90°C takes about twenty minutes at this chamber temperature Pit137°C Internal85°C +2h05
  6. 18:20 Sauce brushed on, lid down Thin sauce, one coat, ten minutes to set Pit137°C Internal89°C +2h20
  7. 18:30 Pulled, rested 15 minutes, cut one bone at a time Fifteen minutes is enough for baby backs; longer and they cool past serving temperature Pit137°C Internal90°C +2h30

Baby backs are not small spares

A baby back is the loin-side rib, running from the spine down to where the spare begins. It has a thinner meat layer, less fat, a curved bone and almost no skirt. A spare is the belly-side rib with the brisket bone and the skirt attached.

That is why the two need different treatment. The thinner layer on a baby back cooks through in half the time and dries out faster. Any wrap at all — even thirty minutes — turns the surface soft and there is not enough meat underneath to make that trade worthwhile.

Baby back against spare
MeasureBaby backFull spare
Weight per rack1.1-1.5 kg2.0-3.0 kg
Fat content18%26%
Time at 135°C2 h 30 m4 h 00 m
WrapNever40-50 min if at all
Bone shapeCurved, shorterStraight, longer

Two-zone on a kettle and one chimney of charcoal

One chimney of lit briquettes, about 1.2 kg, spread over half the charcoal grate. The rack sits over the empty half with the lid on. That gives 135°C at the grate and it holds for two and a half hours with no top-up, which is exactly the length of this cook.

If the kettle has a hinged grate, add four unlit briquettes through the hinge at hour one. It is not necessary for baby backs but it gives a cushion if the weather turns.

  • One chimney (1.2 kg) of lit briquettes, one half only
  • Rack over the empty side, bone side down, lid on, vents half open
  • Rotate end to end at 25 minutes and again at 90 minutes
  • No top-up needed for a 2.5 hour cook in still air

Reading a baby back without a thermometer

A probe between the bones on a rack this thin reads the air more than the meat. The bend test and the bone pull-back are better instruments. At 135°C, expect 4 mm of pull-back at ninety minutes and 8 mm at two hours.

If you want a number, take the thickest part of the meat between two bones, not on top of a bone, and pull at 90°C. Under 86°C the rib fights the bite; over 94°C it shreds.

Signs at 135°C
TimePull-backBendAction
55 min0 mmRigidWait
1 h 30 m4 mmSlight giveSecond rotation
2 h 05 m8 mmCracks on topStart checking
2 h 20 m10 mmBows easilySauce now
2 h 30 m11 mmAlmost breaksOff

Sauce, rest and serving

Ten minutes of sauce on the grate is the whole sauce stage. Thin it with cider vinegar — two parts sauce to one part vinegar — so it sets as a glaze rather than a coating, and put it on with a brush, not a mop, so you are not adding liquid to the fire.

Rest fifteen minutes loose under foil. Baby backs cool fast because they are thin, so fifteen minutes is both the minimum for juice redistribution and the maximum before they are lukewarm.

  • Sauce thinned 2:1 with cider vinegar, brushed on, ten minutes
  • Rest 15 minutes, loosely covered
  • Cut with a sharp knife, bone side down, straight down between bones
  • Serves two as a main with two sides, four as a starter

Cross-section notes

bladeCross-section bands (scaled to fat cover)Rings = smoke ring; horizontal lines = muscle grain
Slice direction: Across the bone, one thick slice per rib

Baby backs are a different cut from spares, not a smaller version of them. The cross-section shows a thinner meat layer over the bone — about 18% fat against 26% for a spare — and almost no skirt or brisket bone. That thinner layer is why they cook in half the time and why wrapping them is always a mistake.

Stall
0°C
Wrap method
No wrap (bare bark)
Wrapped at
never wrapped
Pulled at
90°C
Rest
15m
Score
4.6/5

Verdict: Two and a half hours at 135°C on a kettle, no wrap, no spritz, no sauce until the last ten minutes. It is the fastest good rib on this ledger and it costs one chimney of charcoal.

Adjacent entries

DateCutWood CookerWeightResult
8 Sep 2026 Full spare ribs, untrimmed Cherry Bullet water smoker 5.1 lb / 2.3 kg Fall-off-the-bone, which is the failure state for ribs3.9/5 15 Sep 2026 Two spare racks, membrane on and off Hickory Insulated cabinet 9.3 lb / 4.2 kg (2 x 2.1 kg) Identical texture; the membrane rack was 6% heavier and saltier outside4.4/5 16 Oct 2026 Pork tenderloin Apple Pellet grill 2.4 lb / 1.1 kg (2 pieces) Juicy at the thick end, chalky at the tail3.8/5

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