Diono Radian 3R SafePlus
The Diono Radian 3R SafePlus rear-faces up to 50 lb, forward-faces up to 65 lb, and is 17 in wide, per Diono. All-in-one 3-across seat from Diono; the maker describes the SafePlus version as having 15 upgrades over the Radian 3R.
- $259.99List price
- 50 lbRear-facing to
- 65 lbHarness to
- 120 lbBooster to
Radian 3R SafePlus: key facts
- The Diono Radian 3R SafePlus rear-faces from 4 to 50 lb and 18 to 44 in tall; forward-faces with a harness from 26.5 to 65 lb; works as a booster from 40 to 120 lb, per Diono.
- Diono says it expires 10 years after the date of manufacture.
- It's 17 in wide at the widest point and weighs 29.3 lb.
From Diono's published specs. Always follow the limits on your seat's labels.
How the Radian 3R SafePlus stacks up
Against the 57 all-in-one car seats we track. The shaded band is where the middle half of them fall; the dot is this one.
The same as most all-in-one car seats (10 years).
Above the 40 lb most all-in-one car seats list.
Below the typical range for all-in-one car seats (18.3 in to 19.5 in).
Within the typical range for all-in-one car seats (20 lb to 29.3 lb).
Within the typical range for all-in-one car seats ($229.99 to $399.99).
What sets the Radian 3R SafePlus apart
Measured against the 57 all-in-one car seats we compare, from each maker's published specs.
- Highest rear-facing limitof the 57 all-in-one car seats with it published: 50 lb
- Anti-rebound bar7 of the 56 all-in-one car seats with this listed have it
- 4th narrowestof the 33 all-in-one car seats with it published: 17 in
- Weight: 29.3 lbin the middle half of the 35 all-in-one car seats that publish it (20 lb to 29.3 lb)
Next to its closest matches
- Graco Extend2Fit 3-in-1Next to it, the Radian 3R SafePlus is 2 in narrower; 8.7 lb heavier; has anti-rebound bar (the Extend2Fit 3-in-1 doesn't).
- Evenflo Symphony Extend Breeze 3-in-1Next to it, the Radian 3R SafePlus is 1.5 in narrower; 12.3 lb heavier; $20 less.
- Evenflo All4Stages Slim Plus Canopy 4-in-1Next to it, the Radian 3R SafePlus is 10 lb higher rear-facing limit; 0.1 in wider; 4.1 lb heavier; has anti-rebound bar (the All4Stages Slim Plus Canopy 4-in-1 doesn't).
Listed features
- Maker states it fits 3-across and includes a steel anti-rebound bar
- Maker lists a 12-position headrest
- Maker lists 'FAA approved for airline use'
Where to buy the Radian 3R SafePlus
Prices and availability change. We may earn a commission from some links.
- Check for recalls: Search the agency's recall list with the model number and date code from the label: NHTSA recall search.
- Car seat use and installation: see NHTSA's car seat page, which also lists free car seat inspection by certified technicians. Check the label and the maker's instructions, and ask your pediatrician about your child.
Full specs
| Diono Radian 3R SafePlus | |
|---|---|
| Type | All-in-one |
| List price | $259.99 |
| Rear-facing weight | 4–50 lb |
| Rear-facing height | 18–44 in |
| Forward-facing weight | 26.5–65 lb |
| Booster weight | 40–120 lb |
| Seat weight | 29.3 lb |
| Width | 17 in |
| Anti-rebound bar | Yes |
| Expires after | 10 years |
Compare the Radian 3R SafePlus with
How each closest rival differs from the Radian 3R SafePlus, from the makers' specs.
- GracoExtend2Fit 3-in-1rear-facing to 50 lbforward-facing to 65 lb$269.99
- 2 in wider
- 8.7 lb lighter
- $10 more
- EvenfloSymphony Extend Breeze 3-in-1rear-facing to 50 lbforward-facing to 65 lb$279.99
- 1.5 in wider
- 12.3 lb lighter
- $20 more
- EvenfloAll4Stages Slim Plus Canopy 4-in-1rear-facing to 40 lbforward-facing to 65 lb$259.99
- 10 lb lower rear-facing limit
- 0.1 in narrower
- 4.1 lb lighter
- Disney BabyEverSlim 4-in-1rear-facing to 40 lbforward-facing to 65 lb$259.99
- 10 lb lower rear-facing limit
Radian 3R SafePlus: questions answered
From Diono's published specs, last checked 2026-11-06.
Does the Diono Radian 3R SafePlus rear-face longer than other all-in-one seats?
Yes. Its 50 lb rear-facing limit is the highest of the 70 all-in-one seats we track, tied with 14.
Will the Diono Radian 3R SafePlus fit three across or in a small car?
It's narrower than 86% of the all-in-one seats we track, at 17 in. The narrowest is the Chicco Fit3x ClearTex Ultra-Slim All-in-One at 16.7 in. Fit depends on your vehicle; check each seat's manual and your vehicle manual. Car seat use and installation: see NHTSA's car seat page, which also lists free car seat inspection by certified technicians. Check the label and the maker's instructions, and ask your pediatrician about your child.
Radian 3R SafePlus or Extend2Fit 3-in-1: what's different?
By the makers' specs, the Radian 3R SafePlus has an anti-rebound bar; the Radian 3R SafePlus lists for $10 less. See every spec side by side.
Is it OK to buy a used Radian 3R SafePlus?
NHTSA publishes guidance on used car seats on its car seat page. Diono lists a lifespan of 10 years from manufacture for this model. Check the label and the maker's instructions, and ask your pediatrician about your child.
Still wondering? Write to us at hello@cribpicks.com and we'll look it up.
More all-in-one car seats
- Joiesaffron SI 4-in-1rear-facing to 40 lbforward-facing to 65 lb$249.99
- Maxi-CosiPria All-in-Onerear-facing to 40 lbforward-facing to 65 lb$269.99
- Disney BabyGrow and Go All-in-Onerear-facing to 40 lbforward-facing to 65 lb$269.99
- GracoGrows4Me 4-in-1rear-facing to 40 lbforward-facing to 65 lb$229.99
- GracoSlimFit 3-in-1rear-facing to 40 lbforward-facing to 65 lb$229.99
- ChiccoFit3x ClearTex Ultra-Slim All-in-Onerear-facing to 40 lbforward-facing to 65 lb$229.99
Where these specs come from
Last checked 2026-11-06. Spot something wrong? Tell us. Read our editorial and safety policy and corrections.