Looks like Giant is dropping some kids bikes with the STP line for 2021. They seem to have some solid features, and some not so much.
Starting with the 20" models they have the STP 20 ($???) and the STP 20 FS ($475). Specs are are pretty similar across the board. The FS model gets you an 80mm Suntour XCT coil fork (vs rigid alloy), Tektro hydraulic discs (vs mechanical), Microshift 12-42T drivetrain (vs Altus) and 2.2" tires (vs 2.6") The photos of the FS model show the Altus, not Microshift drivetrain. Both bikes are also shown with Revo grip shifters. Geometry highlights include 69 HA, 73 STA and 127mm cranks.
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Next up are the 24" models consisting of the STP 24 ($440) and the STP 24 FS ($530). Differences between the 24" models mirror those on the 20" models. However, the photos actually show the Microshift drivetrain (including shifter) on the STP 24 FS. HA and STA match the 20" model, but the cranks get a bump to 140mm.
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The 26" models are a bit of a departure from the smaller STP models. Here we see offerings of STP 26 SS ($950) and STP 26 ($1020). Equipped with the 120mm Rockshox Recon RL, the two bikes are spec'd identically, except for the drivetrain. The SS model is a single speed 30/14 and the other model is equipped with a Deore 11-46 10 speed. Both bikes use the same frame (available in "regular" and "large") with an adjustable horizontal drop out. The SS gets a tensioner, while the the other has a derailleur hanger. On both size frames, HA = 67 and STA = 73.5. The 26" model also gets 150mm cranks.
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Comparing the geometry of the 24" model to the database I have put together...
STA: 73 (73.5 avg)
HTA: 69 (68 avg)
TTL: 495 (506 avg)
CS: 410 (401 avg)
Reach: 335 (348 avg)
Stack: 524 (505 avg)
Wheelbase: 978 (987 avg)