Diamondback El Oso Niño

BikeRide Score

Summary of Reviews

We have read all expert and user reviews on the Diamondback El Oso Niño. In summary, this is what cyclists think.

5 reasons to buy

  • The El Oso Niño is one of the lowest-priced children's fatbikes.
  • Families found this fatty rolled well on beach-sand, snow and trails.
  • One expert said his son’s confidence increased due to fat-tire stability.
  • The Oso Niño’s standover height was just right for little ones.
  • A Dad found the 7-speed drivetrain offered a good gear range.

2 reasons not to buy

  • At 35lbs for a kids’ bike, this fatty was Oso heavy!
  • There were derailleur issues; being sucked into the back wheel, breaking after one small fall, bending easily.

Bottom line

When the El Oso Niño was released, there were very few options for a kids’ fatbike. As is the case with adult fatties, there tends to be a big gap between low-end and high-end options. Fatbikes are expensive to build. As a consequence, the budget Niño, while being a “big step-up from a Walmart Mongoose” (one parent’s words), does come with some compromises. It’s weighty. At 35lbs, it’s heavier than many adult bikes. Also, the weak rear derailleur was itching to be replaced. These flaws aside, the added confidence (through extra stability and traction) meant that the Niño could train tots up to go mountain biking with the big kids.
Where to buy
We earn affiliate commission. Learn more
Bike Size Charts

BikeRide finds and shows you the best prices of the bikes you want to buy. Prices constantly change and it’s impossible to compare them all yourself.

We search for prices on over 120 bike retailers to guarantee that we find the lowest prices – to save you time and money.

It’s a promise we stand behind: If you find a lower price on a bike elsewhere, we will sell it to you for 10% less. For example, if you find a bike for $480 that we have listed at $500, we will offer you to buy it for $432 through BikeRide. The bike must be the same color and size, sold in the US and not include the use of a coupon.

If you find a lower price, email us at [email protected] with documentation of the price. We’re committed to making sure that the cost of a bike does not keep you from cycling!


Release Year
Wheel Size
Number of Gears
35.0 lbs
Brake Type
Frame Material

Expert Reviews

0/100 based on 0 rated expert reviews
Seths Bike Hacks

Take a Kid Mountain Biking Day

I think the El Oso increased his confidence, as the tires and traction increased his stability.

Visit full review
Fat Bike Family

Diamondback El Oso Niño

The low standover and 7 speed gear ratio have been great so far… Although the Specialized looks like it has higher end parts I just could not justify the added $300… There is a weight penalty and a lower part spec.

Visit full review

User Ratings

80/100 based on 28 ratings
  • 5 star
  • 4 star
  • 3 star
  • 2 star
  • 1 star

Bike Comparison

Diamondback El Oso Niño in comparison to averages
Diamondback El Oso Niño