Coospo S10 - yet another Easton interface budget power meter spider

[offspring_fan]

gplama reports that this one is crap too. Likely shares hardware with the Thinkrider PP5 - the firmware numbers are the same (and updates were released at the same time, again to the same firmware version), and the issues are the same. Another one to avoid.

Quelle surprise! Glad I cancelled my order 

[Scott902]

[gplama]

Coospo releasing a new revision already? I'll try to find out more details....

[Tpower59]

Looking at the issues with CooSpo and the restrictions in some regions, in my opinion, the Magene https://it.aliexpress.com/item/1005004540845201.html remains the only real solid alternative to the Garmin Varia right now.

It's widely available, the radar detection is almost on par with Garmin, and it actually allows for a lot of customization via the app (brake light settings, patterns, etc.) which is where CooSpo seems to struggle. Plus, it's significantly cheaper than a Varia RTL515 without feeling like a 'beta-test' product.

Has anyone here compared the L508 side-by-side with the new CooSpo radar in terms of false negatives?

No false negatives on my Coospo Radar
Only few false positive of cars in opposite direction
Even detected a motorcycle this afternoon

[kubackje]

Looking at the issues with CooSpo and the restrictions in some regions, in my opinion, the Magene https://it.aliexpress.com/item/1005004540845201.html remains the only real solid alternative to the Garmin Varia right now.

It's widely available, the radar detection is almost on par with Garmin, and it actually allows for a lot of customization via the app (brake light settings, patterns, etc.) which is where CooSpo seems to struggle. Plus, it's significantly cheaper than a Varia RTL515 without feeling like a 'beta-test' product.

Has anyone here compared the L508 side-by-side with the new CooSpo radar in terms of false negatives?

Only solid alternative to Garmin varia is igpsport Sr mini. I have both magene and igpsport and Sr mini is way better

[Scott902]

Only solid alternative to Garmin varia is igpsport Sr mini. I have both magene and igpsport and Sr mini is way better

I believe @GPLama suggests the Sigma and Lezyne radar units as solid alternatives.

[kubackje]

I believe @GPLama suggests the Sigma and Lezyne radar units as solid alternatives.

It's chinertown so I wrote about Chinese options. I'm sure if he tests igpsport Sr mini he will like it. It's better then magene, and magene wasn't that bad in his tests.

[kbernstein]

Looking at the issues with CooSpo and the restrictions in some regions, in my opinion, the Magene https://it.aliexpress.com/item/1005004540845201.html remains the only real solid alternative to the Garmin Varia right now.

It's widely available, the radar detection is almost on par with Garmin, and it actually allows for a lot of customization via the app (brake light settings, patterns, etc.) which is where CooSpo seems to struggle. Plus, it's significantly cheaper than a Varia RTL515 without feeling like a 'beta-test' product.

Has anyone here compared the L508 side-by-side with the new CooSpo radar in terms of false negatives?

SR Mini absolutely clears the magene l508. no contest

[zealot128]

SR Mini absolutely clears the magene l508. no contest

unconditional agree -
Magene: 2-5 false positives per hour, about 100m-120m effective distance
iGPSports sr-mini: i can only remember 5 total false positives or so (tunnel, metal-bridge), range is beyond display range of Wahoo Elemnt bolt v2 - means, the dot of the car is not visible on first detection.

As they are priced the same, IMO iGPSport SR-Mini clears the floor with Magene, as it is better looking IMO, lighter, better detection range, FAR FAR few false positives.
only downside, compared to gplamas reviews of Varia radar i guess is the stationary detection, like a car, bike is hovering behind you, sr-mini will clear it, as every other radar besides the Varia Vue.

[raisinberry777]

Updated S11 model available on Taobao:

https://e.tb.cn/h.RJytrLh3RXsGHDI?tk=2AI9g6EyG2t

[zealot128]

Updated S11 model available on Taobao:

https://e.tb.cn/h.RJytrLh3RXsGHDI?tk=2AI9g6EyG2t

According to my contact at Coospo, that is only a slight optical variant for chinese market of the S10 and uses same internal PM. There will be a new release that is not announced yet.
According to my latest info, the data problems on this model is also partially due to the Easton interface + this particular model, so they might switch 8b or Shimano in the future.
Also testing the S10 with carbon crankset at the moment against the Assioma Duo. The newest firmware version is 1.8.5 on Coospo Tools, doing a update is very much required, because my first ride on stock 1.3.0 was ... all over the place.

[zealot128]

I've now tested the S10 (with the Coospo carbon crankset) against my Favero Assioma Duo, about 8 hours of dual recordings over several weeks. Coospo sent me the crankset and later a replacement unit.
The carbon arms 165mm with Ti spindle are 352 g on my scale, 453 g with the spider, which i think is a good value. I paired it with a Riro 2x chainrings.

Unit A read +6 to +12 % high. Not a percentage error but a fixed offset of roughly +16 W, mid-ride zero moved it by 13 W. After I sent them the raw files, Coospo diagnosed a factory calibration fault and replaced the spider. They asked me to send it back for analysis which i did.

Unit B :

• -2 to -3.5 % vs. the Assioma on every ride, proportional across the power range, no drift over 2.5 h
  
• Zeroing mid-ride changed nothing
• No residual torque after sprints in my rides  (besides the -2-3.5% already).
• Dropouts (zero watts for 1-4 s) happen almost only when cadence changes: about 10 % of those seconds vs. ~0 % at steady cadence (Same issue with GeoID btw)

So: it does not reach the claimed ±1% + ±1% Assioma. A good unit is fine for averages and trends though, if both calibrated the different average calculations where really close:

Best ride (-2.0 % 2h20m), Coospo vs. Assioma: mybike.parts/pm/6BDhNioYEyyaXqp2xHrX_w
Another quick ride: more sprint/residual focussed with another control head-unit (iGSport): https://mybike.parts/pm/vRiCMP-2nlW82K3I-z9kHA
One big learning for me: every head-unit produces it's own interpretation of averages, like iGPSport i630 and Wahoo received the same Ant+ packages but the values still differed. One area for me for further research, checking if that is something with missing Ant+ packages.

Video (German):

Info on next power-products from Coospo 2027:

• S11: same as the S10, just a different look, for the Chinese market. Not a successor
  
• S20: the actual successor, spider for SRAM 8-bolt cranks instead of Easton CINCH, and still 4B BCD chainrings. Coospo says it is much more accurate, as they see the Easton interface as the weak point. Planned for 2027, already shipped und sold inside China to offline customers/shops, so they can get a better understanding first
  
• P10K / P10S: power meter pedals, Look Keo (first) and Shimano SPD-SL (later?).