? 4 kg the BT700 now ? and they doesn't propose the 835 ? have you explanation ?
SZZS CEF69 Build with New Bafang M510 3.0 version
- Thread starter temon10
- Start date
battery dimensions in mm, not weight!
and I put the geometry for xl size, I didn't see a table with xl!
I haven't seen it, it won't be a waste. Do you have the dimensions of the battery?
no, not received. but may be the same than CEF50 ?
curufinwe_wins
Member
They do provide the 835Wh carbon battery by default. I dont have dimensions because its in the bike now, but I'm 100% sure some thread on this forum already has it.
lalachill
New Member
- Feb 15, 2026
- 17
- 4
200km in! Bike has been a blast. Pretty impress with the battery life and the power of the motor.
One thing I wish for the bike right now is that, a link for an MX setup. Or a rear triangle for 27.5 setup.
Current setup is a 170mm front and a 65mm stroke on the rear.
Bike is pretty linear, I needed two token on my rear shock and I'm just about 120lbs.
I typically get away with one only. Overall, pretty rad bike for it's price.
One thing I wish for the bike right now is that, a link for an MX setup. Or a rear triangle for 27.5 setup.
Current setup is a 170mm front and a 65mm stroke on the rear.
Bike is pretty linear, I needed two token on my rear shock and I'm just about 120lbs.
I typically get away with one only. Overall, pretty rad bike for it's price.
I'm trying to modify it so there could be a yoke with a flip chip to allow 29 or 27.5.
I've been checking some CNC pages that they fabricate based on a step file and it's Circa $200, but I believe that number could go down if there's a big order, or also hopefully Jean can fabricate them in China and include it, i'll share it with him as soon as I have it ready and tested by 3d printing it.
so can't an offset bushing be used instead of a flip chip?
curufinwe_wins
Member
Running 27.5 instead of 29 is only a 14mm drop, less if you run bigger tires (like a 2.6 in 27.5 is the same diameter roughly as a 2.35 in 29er).
Just run it and be happy. Don't need flip chips for that stuff. Worse comes to worst, slightly shorten your stroke length on the shock.
Just run it and be happy. Don't need flip chips for that stuff. Worse comes to worst, slightly shorten your stroke length on the shock.
Before working on longer link (that simulate flip chip), have you checked if you can lowered the rear triangle beyond the 205 mm of the original shock absorber ? impossible on the Cef50, raison why i can't use it in mullet
Yes, I do have the step for the frame so extending it to a level that the rear triangle doesnt interfere with the frame by going lower.
It's hard finding the balance of how many mm's I can move further without interference, cause the real difference is 19mm to keep exact the same BB, best doable is 10mm by making the link 3.3mm longer between shock and the other link, getting to a midpoint
lalachill
New Member
- Feb 15, 2026
- 17
- 4
Thank you for your hard work. $200 is really steep. But I'll be down to start saving.
I wish i could help but i have no knowledge about engineering that kind of stuff.
Last edited:
Dans ce cas, il serait peut-être plus facile de remplacer un amortisseur arrière 205 par un 215 classique ?
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I'm pretty sure this can go way lower if at least 10 are made, but first need to test it 3d printed (I can do it at home), ensure everything looks perfect and then send it to Jean or get a better offer from Xmake
If someone can remove 1 bolt from the shock and try to move the link as back as possible till the seatpost contact with the frame can you measure me how many mm's could go back between the shock and the link?
It is to ensure how much the link could work for 27.5 without interference
Will try to explain with pictures:
It is to ensure how much the link could work for 27.5 without interference
Will try to explain with pictures:
Yes, like how much the link can go back and how much "Larger" I can make the connecting link so it works with 27.5 with the same or almost the same bb height.
It can be measured even by puting some painters tape in the shock where it touches the link and moving it back, the difference is how much
lalachill
New Member
- Feb 15, 2026
- 17
- 4
Not much. The one I highlighted (yellow) and measuring the two closest part between the link and framce, which is the top part, it's just around 5-6mm gap.
I think it's the red one that needs to be repositioned to push it down.
Or make the green one longer. But I'm no engineer. lol
The limit of extension is mostly here, not the linkage (easily modifiable)
Green is the one that i'm designing it to be longer/flip chip. But for that to know how longer can be is what patdam say below, need to know what's the limit before the seatstay makes contact with the frame
Exact, but I don't know how much can that go down. Design looks almost the same as my CEF50 down there, even I believe seatstays are all the same for CEF50, CEF69 and CEF55
It's possible,
the limiting point is the linkage contact with seat tube or the rear swing arm with frame ?
The interesting value is the shock length available axe to axe, originaly 205 mm, how many more can be reached ?
That's really useful, thanks!
Tbh for what I see it can move at least 5mm that'd mean that BB height would be almost the same as with 29". (is the distance between the yellow lines, both hole centers displacement)
lalachill
New Member
- Feb 15, 2026
- 17
- 4
This is the most accurate. I marked the frame to where the link touches or the maximum it could extend.
Positioned it back with the bolt on and marked.
Marked it on this note. This is the tip of the link near the bolt hole.
The green highlight is where i marked it against the frame.
PS: Sorry for the continuous post edits.
Positioned it back with the bolt on and marked.
Marked it on this note. This is the tip of the link near the bolt hole.
The green highlight is where i marked it against the frame.
PS: Sorry for the continuous post edits.
I don't see problems for extend the post ? that it's the interest of forum. thank you for your help, i will receive my frame only next month (i hope)
you would mean that you can extend with 7.5mm more before linkage hurt the seat tube ? that would mean that it's keeping gap on swing arm to frame contact to extend more ?
lalachill
New Member
- Feb 15, 2026
- 17
- 4
Nice. have fun putting it together. Just clean the inside of the frame. There are carbon residues when I did mine and it was not fun doing it bare handed.
As for the measurement, it might be off by 0.5-1.0mm. But I'll let you handle that.
UPDATE: That is the chainstay fully extended or dropped. The link did not touch the frame but very very close.
This is amazing. So with all this info I can finish the link. I'll be creating two versions, one that has a flipchip and one 100% for 27.5 and share the STEP files after I 3d print it and test it.
This means that maybe Jean can offer them or anyone can just use a mill printing online service to get the custom yoke
curufinwe_wins
Member
Once again reminding the group here that a 2.6" 27.5 has the same radius as a 2.35" 29er so unless you are planning on running a super small 27.5, there is absolutely no need to buy off more travel or z height.
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