I’ve been testing the Coospo TR70 rear radar for several months. And let’s be honest: on paper, it looks a lot like the Garmin Varia RTL515. Same format, same design, and very similar specs.
So the question is simple: is it a credible alternative or just a less polished copy?
Priced around €75, rated for 140 metres of detection, 40 hours of battery life, and ANT+ / Bluetooth compatibility, the TR70 clearly targets the same audience as the Varia… but at a much more aggressive price.
After several hundred kilometres, on both road and gravel, here’s what I found.
Highlights:
- Truly impressive battery life
- Very few false positives
- USB-C is welcome
- Very solid value for money
Areas for improvement
- Slightly shorter range than the Garmin Varia
- Slightly weaker light output
- Reversed quarter-turn mount
Familiar, but not without nuance
Visually, it is hard to deny the kinship with the Varia. Vertical format, central red optic, quarter-turn mount.
But Coospo opted for a reversed quarter-turn interface. This might seem trivial, but it gets a bit frustrating if you planned to use existing Garmin mounts. It’s impossible unless you flip the mount. I don’t know if this was to avoid direct copies or for legal differentiation, but in practice, it does complicate the ecosystem a touch.
As for dimensions, it’s 96 x 39 x 23 mm with a stated weight of 64 g (60 g on my scale). It’s still a compact, discreet accessory under the saddle.
Where Coospo clearly scores a point is the USB-C port. Unlike the Varia RTL515, which still uses micro-USB, here you charge via USB-C. In 2026, that’s almost the bare minimum, and it definitely makes life easier.
The housing inspires confidence. The plastics are decent without being premium. It’s a functional product, not a ‘status’ object. A lanyard loop is integrated into the radar body – a smart detail if you crash or it comes loose.
Simple, effective, no surprises
Installation is standard: the supplied mount and rubber shims cover different seatpost diameters. The system works well.
I often use it:
- either on a 3D-printed mount fixed to the seatpost,
- or on a mount under the saddle rails, depending on the bike.
The TR70 stays put and doesn’t budge, even on rough gravel.
Connection is straightforward. With the Coospo companion app, pairing is quick. Honestly, I found it easier to connect than the Varia on first setup.
If you use a Coospo GPS, the integration is perfect.
With a Garmin GPS, the essential functions (detection, visual and audible alerts) work without issue.
However, for some advanced settings and especially firmware updates, you’ll need to use the mobile app. You can’t do everything solely through a third-party head unit.
How it actually performs on the road
The TR70 states detection from 5 to 140 metres, with relative speed detection from 6 to 128 km/h.
In practice, detection is effective. I had very few false positives. That matters, because an overly sensitive radar quickly gets annoying.
Does it really detect at 140 metres?
Hard to guarantee in a straight line. My impression: it detects a bit less far than the Garmin Varia on equivalent sections. The difference isn’t huge, but it’s there.
On the other hand, detection consistency is good. Fast vehicles are picked up properly and alerts arrive early enough to adjust your line.
Coospo claims visibility up to 1.6 km and a 220° angle. In the field, the light is decent, but I find it a bit less powerful than the Varia.
It’s not bad, far from it. In daytime use, it’s still visible. But head to head, Garmin keeps a small edge in light output.
The TR70 offers 7 lighting modes:
- low brightness
- high brightness
- breathing
- day flash
- night flash
- group mode
- radar-only
It’s sensible and well thought-out. The ‘group’ mode is useful to avoid dazzling others when riding in a group.
On battery life, though, Coospo really delivers.
Rated at 40 hours in radar-only mode, the TR70 really lasts a very long time. Even in mixed use with the light active, the battery life clearly surpasses most competitors.
That’s probably its strongest argument. For those who ride a lot and don’t like recharging every three days, it’s real peace of mind.
My take on the Coospo TR70
The Coospo TR70 is not perfect. It does not outperform the Garmin Varia across the board.
But at €75, it delivers 80 to 90% of the experience for roughly half the price. And above all, its battery life is a real strength.
For a cyclist who wants a rear radar without blowing the budget, it is a credible, coherent option.
For someone looking for the absolute benchmark, Garmin still holds a slight lead.
Personally, I keep riding with it. And at this price, that’s probably the best compliment I can give it.
