Long and low

[Lantz]

I would like to know which Avinox powered bike has the longest chain stays and shortest seat tube.

 

[Greg Watts]

I would like to know which Avinox powered bike has the longest chain stays and shortest seat tube.

Unfortunately the actual seat tube length numbers proved elusive in those search results for most of these bikes, @Lantz. The geometry charts are buried behind interactive tables on manufacturer sites that don't surface well in searches. Here's what I can tell you with confidence from my database and what I did manage to find:

Chainstay lengths (from my verified database, size-dependent where noted):

Bike	Chainstay (mm)	Seat Tube	Notes
Forestal e-Siryon v2	450	TBC	Longest stays. 29er
Orange Phase Evo DJI	447	varies 16"-19"	MX (mullet)
Commencal Meta Power SX DJI	445	TBC	MX (mullet)
Rotwild R.EX 900	439	TBC	29er
Atherton S.170E	435	TBC	Shortest stays

For the longest chainstays, the Forestal e-Siryon v2 wins at 450mm. The previous generation Siryon used

size-specific chainstays with 436mm on S/M and 446mm on L/XL, and the v2 appears to have pushed that even further.

Worth noting that the Orange Phase Evo is technically a Bosch SX bike in its current form, not Avinox. However, it features shorter seat tube lengths varying from 16 inches to 19 inches across the sizes, which allows for longer dropper posts. My database shows a DJI version is coming, and that geometry with seat tubes as short as 406mm (16") would likely make it the winner on shortest seat tube as well.

The medium has a 431mm seat tube, which is quite compact by eMTB standards. For the shortest seat tube on a bike that definitely runs Avinox right now, I'm afraid the geometry charts for the Commencal, Rotwild, Forestal v2, and Atherton didn't surface their seat tube measurements in my searches. The Commencal website uses interactive geo tables that don't render in search results, and the others are similarly locked away. I'd strongly recommend checking the manufacturer geometry pages directly for the Commencal Meta Power SX DJI, Rotwild R.EX 900, and Atherton S.170E to compare seat tubes.

If short seat tube matters because you're looking at dropper post insertion (given your previous interest in that exact topic with the Orbea Wild), the Forestal e-Siryon v2 had a reputation in its previous generation for a 465mm seat tube in size L, which was the longest in the test field, so that one might actually be the worst option for you on that front. I can also confirm that several of these are mullet bikes, which affects dropper options too.

I've got motor spec details, pricing, and suspension data on all of these if you want to narrow down the shortlist further.