A crowd-network tag and a SIM tracker fail in completely different places · review
A thin AirTag mount from Topeak that sits under a bottle cage or directly on the frame, weighing 8 g with two stainless security bolts.
Our conclusion Thin and tidy, with less published than its rivals.
Topeak is one of the larger bike accessory brands, and its version of the under-cage mount is the thinnest we list, at 0.9 cm.
A polymer mount that conceals an AirTag under a standard bottle cage or on its own on the frame, two stainless steel security bolts, an Allen wrench, a size of 7.7 × 3.45 × 0.9 cm and a stated 8 g.
There is no IP rating, only the words weather-resistant. The product table says 0.04 kg while the bullets say 8 g. Neither matters much on a bike, but the missing water rating makes it harder to compare with the Elevation Lab mount, which states IP68.
Thin is the reason to pick this one, because a low profile keeps the bottle cage close to the frame. Check that your bottle still clears the seat tube once the cage is lifted by 0.9 cm, on small frames in particular.
| Holds | One Apple AirTag, not included |
|---|---|
| Position | Under a bottle cage, or alone on the frame |
| Material | Engineering-grade polymer |
| Size | 7.7 × 3.45 × 0.9 cm (3 × 1.4 × 0.35 in) |
| Weight | 8 g stated in the bullets, 0.04 kg in the table |
| Bolts | 2 stainless steel security bolts |
| Model | TCM-AT |
The listing says weather-resistant polymer and gives no IP rating. The Elevation Lab and CITYWAY mounts here state IP68.
The bullets say 8 g and the product table says 0.04 kg. The 8 g figure probably excludes packaging, but the listing does not explain the gap.
7.5/ 10
Thin and tidy, with less published than its rivals.
Riders who want the thinnest under-cage mount.
Specifications: the manufacturer sheet for bike gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
4G real-time tracking · fall alarm · IP67 · 3 months subscription included
The only true GPS tracker on this shelf: a 4G unit built into a rear light, with real-time location, route recording, motion and fall alarms, and three months of subscription included.
Best for: A valuable bike, or riding where a crowd network is useless — rural roads, quiet times, long distances.
≈ $44.99
AirTag not included · under the bottle cage · IP68 · security screws · 26 g
A slim AirTag mount that sits under a bottle cage or alone on the frame, rated IP68, with security screws and a driver.
Best for: iPhone users with bottle bosses who want a hidden AirTag on the frame.
≈ $19.99
31.8 mm (1.25 in) bars only · 85 dB bell · AirTag 1 and 2 · tools included
A working 85 dB bell with an AirTag concealed inside it, for 31.8 mm (1.25 in) handlebars only, supplied with the tools to fit it.
Best for: Bikes that need a bell anyway, on 31.8 mm (1.25 in) bars, where one product solving two problems is the appeal.
≈ $13.99
Prices quoted in these summaries are dated readings. The live price is shown next to each product.
