Pork ribs are one of the most beloved cuts in barbecue, but standing at the meat counter staring at a rack of baby backs next to a rack of spare ribs can be genuinely confusing. They are both pork ribs. They both smoke beautifully. So what is the actual difference, and which one should you buy?
We have smoked both cuts more times than we can count and the honest answer is that neither is universally better. They are different, and knowing those differences will make you a better cook. Here is everything you need to know.
Where do baby back ribs come from?
Baby back ribs come from the pork loin primal, the section of ribs closest to the backbone and the loin that runs along both sides of the pig’s spine. That location gives baby backs their distinctive curved shape. The rack curves rather than lying flat, and the individual bones are shorter and curved as well.
One thing worth clarifying: baby back ribs do not come from baby pigs. They are called baby backs because they are the smaller rib cut from the pig, not because of the animal’s age.
Because baby backs come from near the loin, they are a leaner cut of rib. The meat sits mostly on top of the bone rather than between the bones. A full rack of baby back ribs typically weighs around two pounds.
Where do spare ribs come from?
Spare ribs come from lower on the pig, from the pork belly primal. That location means you are getting a larger, flatter rack with longer and straighter bones compared to baby backs. A rack of spare ribs typically weighs around three pounds, sometimes more.
The name “spare ribs” comes from the German term “Rippenspeer,” meaning ribs cooked on a spit or spear over fire. That was eventually shortened to spear ribs and then spare ribs.
Because spare ribs come from near the belly, they have significantly more marbling than baby backs. That intramuscular fat is what gives spare ribs their rich flavor and helps keep them moist through a long cook.
You may also see spare ribs sold as St. Louis-style spare ribs at the grocery store. St. Louis-style ribs are simply spare ribs that have been trimmed into a more uniform rectangular shape by removing the rib tips and sternum cartilage. They are easier to cook evenly and look cleaner on the plate. For most backyard cooks, St. Louis-style spare ribs are the way to go if you want spare ribs.
Baby back ribs vs spare ribs: how they compare
Size and shape
Spare ribs are larger in every dimension. The rack is bigger, the bones are longer and flatter, and the overall weight is heavier. Baby backs are smaller, curved, and lighter. If you are feeding a large group, spare ribs give you more meat per rack. If you are cooking for two or three people, a rack of baby backs is usually enough.
Meat content and placement
Baby back ribs have more meat on the surface of the bone. Spare ribs have more meat between the bones. Neither has dramatically more total meat per rack once you account for size differences, but the eating experience is slightly different because of where that meat sits.
Fat content and flavor
Spare ribs win here. Because they come from near the belly, they have more marbling and more fat between and around the meat. That fat renders during a low and slow cook, bastes the meat from within, and delivers a richer, more intensely flavored rib. Baby backs are leaner and milder in flavor. They are still delicious, but spare ribs have a deeper pork flavor that a lot of serious BBQ people prefer.
Tenderness
Both cuts can be incredibly tender when cooked properly. Baby backs are naturally more tender to start because the loin is a less worked muscle. Spare ribs start tougher but the fat content helps them get there given enough time in the smoker. Overcooked baby backs go dry faster because of that leanness, which is something to watch for.
Cook time
Baby backs cook faster. At 225 degrees Fahrenheit, baby backs typically take around four to four and a half hours. Spare ribs at the same temperature will take closer to five to six hours. That difference matters when you are planning your cook and managing your fire.
Price
Baby back ribs are generally more expensive per pound than spare ribs. Part of that is demand driven by their reputation as the more popular cut. If you are on a budget, spare ribs give you more flavor per dollar.
Which should you buy?
It depends on what you are looking for.
Buy baby back ribs if you want a leaner, faster cook with more meat on the surface of the bone. They are a great choice for weeknight BBQ when you do not have all day, and they are more beginner friendly because the shorter cook time is easier to manage.
Buy spare ribs if you want maximum flavor and do not mind a longer cook. The fat content and marbling make spare ribs the choice of most experienced BBQ cooks and competition pitmasters. They are more forgiving in a different way: the extra fat protects them from drying out if you push the cook a little long.
Our personal preference at Angry BBQ is spare ribs for flavor, but we smoke baby backs just as often because the shorter cook time fits better into a busy weekend.
How to smoke baby back ribs
Because baby backs are leaner and smaller, they do best with a slightly shorter method. We recommend the 2-2-1 method for baby back ribs: two hours on the smoker unwrapped, two hours wrapped in foil, and one hour back on the smoker with sauce. This gives you tender ribs with a little bite rather than fall-off-the-bone, which most experienced pitmasters consider the better result.
Key tips for baby backs:
- Remove the membrane from the bone side before cooking. It does not render down and creates a chewy barrier between the smoke and the meat.
- Smoke at 225 to 250 degrees Fahrenheit. Baby backs are lean enough that higher temps can dry them out.
- When wrapping, consider cooking them bone side down so the lean meat sits in the liquid and stays moist.
- Pull them when you get a good bend test. Grab the rack in the middle with tongs and lift. If the meat starts to crack on the surface, they are done.
How to smoke spare ribs
Spare ribs need more time and handle higher temps a little better thanks to all that fat. The classic approach is the 3-2-1 method, though we prefer a less rigid approach that focuses on feel and temperature rather than strict timing.
Key tips for spare ribs:
- Remove the membrane just like you would on baby backs.
- If you buy full spare ribs rather than St. Louis-style, trim them down before cooking. Remove the rib tips and the sternum flap so the rack cooks more evenly.
- Smoke at 225 to 250 degrees Fahrenheit for five to six hours.
- The extra fat in spare ribs means they are more forgiving. If you run long by 30 minutes, they will likely still be great. Baby backs in the same situation would be in trouble.
- Use the same bend test to check for doneness.
For more detail on timing, check out our guide on how long to smoke a rack of ribs.
What about St. Louis-style spare ribs?
St. Louis-style ribs are spare ribs that have been trimmed into a rectangular shape. The rib tips and the brisket bone are removed, leaving a cleaner, more uniform rack that cooks more evenly and looks better on a plate.
If you are buying spare ribs for a backyard cook, St. Louis-style is almost always the better buy. The trimming has already been done for you, the rack cooks more evenly, and the portions are easier to manage. Full spare ribs are fine but require more prep work.
Frequently asked questions
Are baby back ribs more tender than spare ribs?
Baby backs are naturally more tender to start because they come from a less worked muscle. However, spare ribs cooked low and slow until the fat has rendered are equally tender. The difference comes down to cook time and technique more than the cut itself.
Which ribs are better for beginners?
Baby backs are a little more beginner friendly because the shorter cook time is easier to manage. That said, spare ribs are more forgiving when it comes to overcooking because of their fat content. Either cut is a good starting point.
How many ribs do I need per person?
For baby back ribs, plan on about six bones per adult and three per child. For spare ribs, four bones per adult and two per child is a good guideline. Use our rib calculator to figure out exactly how many racks to buy for your next cookout.
What is the best wood for smoking ribs?
Fruit woods like apple and cherry work well with both baby backs and spare ribs. Hickory and oak give you a stronger, more classic BBQ smoke flavor. Check out our guide on the best wood for smoking ribs for a full breakdown.
Can I cook baby backs and spare ribs at the same time?
Yes, but plan to pull the baby backs earlier. At 225 degrees Fahrenheit, baby backs will finish 45 minutes to an hour before spare ribs. Keep a thermometer handy and check each rack independently rather than pulling both at the same time.
