Royce Union RTT
- Mountain Bike
- More reviewed than 91%
A well equipped 24 inch wheel bike for smaller riders, worth it if your inseam matches the stated minimum, since the Shimano drivetrain is a step up from typical bikes at this wheel size.
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How it ranks among the 95 mountain bikes we track
4.0★ across 762 Amazon ratings, Bayesian-smoothed toward the category average.
762 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 95 mountain bikes we track - how the scorecard works · full mountain bikes data report. Confidence: limited - incomplete product information.Last refreshed Jun 21, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
A 24 inch wheel mountain bike with a lightweight aluminum frame, Shimano 21 speed drivetrain, and a suspension fork, built for riders with at least a 29 inch inseam rather than full-size adults.
24 inch wheels put this in youth to smaller-adult territory rather than the 26 to 29 inch wheel sizes typical of full-size adult mountain bikes, so fit matters more than the spec sheet here. The drivetrain itself, a Shimano EZ Fire Plus trigger with TY300 rear derailleur, is the same tier of component found on entry adult bikes, just scaled to a smaller frame. Buyers should check the stated 29 inch minimum inseam against their own measurement before ordering, since wheel size dictates who this actually fits.
- 24 inch wheels, minimum 29 inch rider inseam
- Shimano 21 speed drivetrain with trigger shifting
- Suspension fork and machined alloy rims
- Aluminum frame with gloss silver finish
Who it's for
Fits younger or smaller riders who meet the 29 inch minimum inseam and want a bike with real Shimano shifting rather than a toy grade drivetrain. Not sized for a full-height adult looking for a standard 26 inch or 29 inch wheel mountain bike.
Strengths and trade-offs
Drawn from this product's published specifications.
- Shimano EZ Fire Plus shifting across 21 speeds
- Lightweight aluminum frame with suspension fork
- Machined alloy rims for better brake contact
- Ships with tools for assembly
- 24 inch wheels limit it to riders near the 29 inch minimum inseam, not full-size adults
- No reviews yet to confirm assembly ease or long-term durability
Performance notes
The Shimano EZ Fire Plus trigger shifter and TY300 rear derailleur are what separate this from a bike with generic shifting, giving 21 speeds of indexed gear changes from one thumb and finger motion. Alloy linear pull brakes paired with machined rims are chosen for more consistent pad contact than standard steel rims, and the suspension fork is there to take the edge off bumps on trail riding rather than for aggressive downhill use.
Specifications
| Brand | Royce Union |
|---|---|
| Model | 74408 |
How it compares
This product against the closest alternatives we track in mountain bikes.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Royce Union RTTThis product | 4.0 / 5 | 762 | 2.7 / 5 |
| Mongoose Dolomite Fat Tire Mountain Bike | 4.4 / 5 | 2,281 | 4.1 / 5 |
| Mongoose Malus Mens and Women Fat Tire Mountain BikeBrand | 4.4 / 5 | 1,500 | 4.1 / 5 |
| Schwinn Bonafide Men and Women Mountain BikeSchwinn | 4.2 / 5 | 667 | 4.1 / 5 |
| WEIZE Mountain Bike, 24 26 27.5 inch Outdoor MTB Bicycle, 6/18-Speed High-Carbon Steel…Weize | 4.1 / 5 | 599 | 4.0 / 5 |
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Questions about the Royce Union 74408
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What size rider fits the Royce Union RTT?
The listing states a minimum inseam of 29 inches for this 24 inch wheel bike, so it suits smaller or younger riders rather than full-size adults.
What drivetrain does the Royce Union RTT use?
It uses a Shimano EZ Fire Plus trigger shifter with a TY300 rear derailleur, giving 21 speeds.
Does the RTT come with assembly tools?
Yes, the bike ships with tools included for assembly.