I wonder is one of us will be the first to build a CEF50 of if someone is Europe or elsewhere is riding one right now?
SZZS specific CEF50-main thread (initial builds and troubleshooting related only)
- Thread starter TCFlowClyde
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TCFlowClyde
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- Thread starter
- #602
I'm hoping Forestal was field-testing the Bafang M820 "drive-unit" aka "motor"
firmware rather than an actual ICE aka "engine" ...if so, I've got the wrong M820!?
Sorry just poking fun on nomenclature...and a slip I made in a forum where one of mechanical engineers would have ripped me on.
Plus, get back on the Mandiran/Mandalorian callout!
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TCFlowClyde
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- #603
Linda confirmed with her engineering team that it was a fit for my RS Ultimate MegNeg. I submitted caliper measurements and they gave me the thumbs up
Chances are good if it's an accurate diagram and spring is same or less width. Posted below a few weeks ago
But it will be the very first item on my checklist to confirm as soon as it comes out of the box.
Myalteregohamish
Active member
Did we figure out if a chain guide was required and if there was a place to mount it? I guess testing would be required first to see if you need one in the first place.
TCFlowClyde
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- #605
I don't see a mount tab? I found that my 1x NW chain and clutch derailleur seem to retain chain well.
In my coil experience on Horst Link bikes, you can take the riders weight, times the Leverage ratio, to get very close to the needed spring rate. In reality only a percent of that weight is on the rear shock, and different seat tube angles and chainstay lengths alter this as well. Never-the-less, it's been shockingly close for me a few times.
So the LR at 30% sag is 3.23, 190# rider would require a 614# spring. So you have 3 problems: 1) that spring is really physically really heavy, 2) most spring rates top out at 650#, basically excluding riders that with their pack are > 200#s, 3) your spring rate just has to be a huge compromise, never being exactly what's needed. In fact, the springs aren't even to spec often varying wildly in rate.
Don't worry. You can always drill a hole in the frame and install a threaded plug.
Stephen B
Member
I am looking at a used fork.
I read through everything but I can't tell how long does the Steer tube need to be?
I read through everything but I can't tell how long does the Steer tube need to be?
TCFlowClyde
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- #609
Please no more frames holes than necessary...sure it will make it lighter but not in a good way.
TCFlowClyde
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- #610
Depends...find your head tube height (HT) from the geo diagram, then measure your stem height. Next is stack height. Add another 2-5 mm for headset cap. Last add another 20- 40 mm for stem spacers as needed for preferred steering height.
I run mine about 30 +mm, but I also use 40-50 mm handlebar risers. The Enduro/trail slacker geo allows for higher steering height overall.
E-mtb headtubes tend to be a little longer than analogue bikes due to higher weight of E-mtb overall, so it might be more challenging to find a longer pre-cut steerer tube unless e-specfic (which Fox I believe is the only E-tuned fork to date).
But it all starts with your frame size HT measurement. The bigger the frame, the longer HT height.
Did I miss anything out there? If so feel free to jump in.
Stephen B
Member
115 ht + ~30 stem+ 30 spacers + 5 caps = 180mm
You need to add about 10mm for the headset cap. Most stems will be more like 40-50mm. You need to add spacers according to how far you want to bend to reach the bars and as TC said how much rise you choose for your bars and any rise in the stem.
temon10
Well-known member
usually bafang frame need 19cm up steertube length will safe.
There is no "usually" it totally depends on rider height and riding style. I need a full length steerer tube. Usual for me is 250mm.
TCFlowClyde
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- #615
Agreed, it might be safer to get a little longer than 180 if you can. Any extra length can go above stem and then you can experiment with different sizes and then trim to preference.
I'm lazy once I get the build complete, any remaining extra I just leave and add spacers if less 5-8 mm, rather than trim a second time.
temon10
Well-known member
i said 19 up, so 19 is minimum for steertube length. And He just said used fork, so usually used fork of manual bike is 17 up. if u want longer just buy new one
TCFlowClyde
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- Thread starter
- #617
I think Mike was implying the longer the steerer tube the more options for best subjective fitment. But 200 mm + would be nice for used on that HT setup. 180 mm likely bare minimum.i said 19 up, so 19 is minimum for steertube length. And He just said used fork, so usually used fork of manual bike is 17 up. if u want longer just buy new one
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temon10
Well-known member
no new news from Linda bro? She said next week will send my order.I think Mike was imply the longer the steer tube the more options for best subjective fitment. But 200 mm + would be nice for used on that HT setup. 180 mm likely bare minimum.
Sorry I misread your post. Yes I was just indicating that buying a used fork that is too short would be a waste of money. Bike manufacturers pre-cut forks for the "average" rider but it is not right for everyone. Cheersi said 19 up, so 19 is minimum for steertube length. And He just said used fork, so usually used fork of manual bike is 17 up. if u want longer just buy new one
Stephen B
Member
I am looking at used Fox x2 210 x 55 rear shock.
Will that fit?
Will that fit?
TCFlowClyde
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- Thread starter
- #623
Linda's engineering team says it should. See above in recent thread.
But first thing I'll do is fit my MegNeg out of the box when frame arrives. My backup was going to be the Fox X2...so that should show you my confidence level.
Stephen B
Member
Thank you TC.
Could you post the actual package purchase link, I want to be sure before I start. From the web sight I am not sure if I am in the right place.
Thank you
Could you post the actual package purchase link, I want to be sure before I start. From the web sight I am not sure if I am in the right place.
Thank you
Stephen B
Member
is this it?
Trending Products 2023 New Arrivals Mtb Bike 29 Full Suspension Frame For Mountain Bikes High Quality Bafang M820 - Buy Mtb Frame 29 Full Suspension,Mtb Bike 29 Full Suspension Frame,Mtb Frame Full Suspension Product on Alibaba.com
Trending Products 2023 New Arrivals Mtb Bike 29 Full Suspension Frame For Mountain Bikes High Quality Bafang M820 - Buy Mtb Frame 29 Full Suspension,Mtb Bike 29 Full Suspension Frame,Mtb Frame Full Suspension Product on Alibaba.com
www.alibaba.com
TCFlowClyde
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- Thread starter
- #626
That's the link.
temon10
Well-known member
yes that one.
Stephen B
Member
Thanks you.
I got a 210x55 at first but the note up in the thread is using a 27.5 wheel not a 29er...
TCFlowClyde
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- Thread starter
- #630
210x55 Is a safe upgrade on rear stroke. Can go shorter crank arms too if worried about bottoming out. I find 155-160 mm is becoming more common to avoid pedal strikes. But some argue on lighter weight builds 165 mm may be optimal. lf u gotta pedal w/o power, they're still long enough for leverage.
I went 155 mm cranks on a 55 rear stroke on a 27.5er. But the 180 fork should give more motor clearance.
Nice thing is the CEF50 geo accommodates both Enduro and/or trail build. Hey, doesn't Transition do the same with the PNW (Enduro) v. their trail builds?
So should be several cool versions of CEF50 to fit your riding style.
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