Cro Motor v2 Dropout Dimensions with 8/9 freewheel

Merlin

Merlin

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europe
Hi,
can someone tell me the Dimensions using a 8/9x Freewheel?

I know for a cro u need 145mm dropouts with singlespeed Freewheel.
i am asking cos i can get a 157mm Dropout Frame and it would be cool if it fits with a normal 9x Freewheel.

thx
 
Ok thx.

so it doesnt matter if my Dropout is 145 or 157mm.
Single Speed and thats all :x


in Germany a Singlespeed is hard to find.

Can anyone link me to the smallest Possible? I think 11 teeth it not Possible...But a 13 teeth freewheel?

thx
 
Hey Merlin. There are some options. One is the Dos Eno 2 speed freewheel that is the same width as most of the single speeds.
image.jpg

Also there is the Como 3speed freewheel these seem to be pretty low quality but they are available on amazon.
image.jpg

I am using one on my Giant DH comp build and had to make some pretty minor modifications to get it to fit. I have documented them on my build here:
http://endless-sphere.com/forums/viewtopic.php?f=2&t=55605

With three or two speeds you can definitely make it work with a drop-out your size. I just had mine modified to get to 155 and I couldn't be happier.

Kdee, I would be very interested in a 11, 10, or 9 speed freewheel how are you going about building one? Obiwan
 
Hey Obi,

nice Build thread...*subscribed* ;)
the Freewheel looks cool. 100 bugs for it....that hurts a bit.
But thx...good to know where i can get those quality freewheels.

did you know the difference between normal freewheels(Single) and BMX freewheels?

iam asking because for a BMX, i found a 13 teeth.

http://www.bike24.de/p144711.html?gpo=177199
 
Merlin said:
Hi,
i am asking cos i can get a 157mm Dropout Frame and it would be cool if it fits with a normal 9x Freewheel.
thx
Click to expand...

Not sure I get it. Why do you want a normal 9x Freewheel?
If it is to be able to pedal this thing in anything over 14T on the rear, better think twice. No way you are going to pedal that heavy monster more than a hundred yards.
If it is to get to the 11T gear, it makes sense to me. However, with a 7x you can get to a 12T and with a single speed you might get a 13T.
 
yes it is to get a 11T
i want to pedal ~50kph
it is for daily commute to work.
and i like to drive with PAS...
on 50kph i get enough wind that i can do something for my belly and doesnt need to change clothes at work ;)

with 13T and 48 in front you pedal like hell for that. 14,15,16T isnt possible to pedal 50kph.
and on my DH Frame i dont think so that i have space for a 70T (crank side)

yep i know...a schlumpf high speed would be the best, but 500$ for it, just to pedal, i have to think more times about :p

The little Problem all about is Money...
as you can see in my sig, theres a street bike...i like to drive. Had enough Power in every situation,
and looks stealthy enough for street riding.
BUT
i miss the (harder) offroad part. I come from Motocross...switched to downhill riding...
i want my 200mm suspension back....i want to drop little gaps...

my Streetbike in Signatur is 3500$ heavy...
my new Build eats 5500$ (DH Frame, Fox Suspension, Float Fork, 24FET, Battery, CroV2 etc)

thats too much....i wish...no, i will try to build this bike to go offroad as i need and make it also "usable" enough for me street needs.
that means the daily drive to work and a every day "walk" with my dog, flying through the woods and hills.
dont ask me about fenders....at this point i dont know how i can realize it, but i need....
and i have to find or build some that my eyes dont get cancer :p

Maybe i go with the 150mm dropout Frame (I Like it more) and not the 157mm....
with Singlespeed i think 150mm would be enough right?

mhh.....
Single Speed 14T means on a Schlumpf High Speed Gear One (27T)
25kph with 90rpm....
second gear means virtuel 67T in front and you can pedal with 55kph and 90rpm.

i hate it that it fits my need 100% :x
 
Merlin said:
did you know the difference between normal freewheels(Single) and BMX freewheels?

iam asking because for a BMX, i found a 13 teeth.

http://www.bike24.de/p144711.html?gpo=177199
Click to expand...

bmx freewheels are design for a smaller thread. they will not fit on cromotor.
the smallest freewheel which will fit is a 16t (manufacturer for example: dicta brand, flux and fly)
 
thx for that picture...
but a 7x wheel is 36mm. you will need 40mm because the screws left.

that means you have ~16mm left.
with a 10mm thick "dropout/trqarm" you have only 6mm left for the Nut....

i dont know but i think a Nut will be around 15mm....

:cry:
 
With a clamping torque arm you don't really need a nut. You could use a half nut, which would be <6.5mm thick assuming the cromotor is an M14 thread.
 
Looking at the photo above more closely that isn't even a standard M14, which has a thread pitch of 2mm. It could be a metric fine, or an imperial thread like UNF...

Either way, standard nut + grinder = half nut :)
 
One way you might get closer to your goal is to do what I did and get a Rennen front chain ring. http://www.rennendesigngroup.com/104mmBCD.html
They make them up to 52 tooth for a variety of crank styles including 104mm BCD 4 hole. Won't get you all the way to where you want to go but closer. I have considered the Schlumpf drive myself but I will try my current setup 16 X 52 first and see how I like it before I spend that kind of coin. It is too bad that the BMX freewheels won't fit our hubs. Obiwan
 
Merlin said:
mh...i read about 16mm axle...so it would be m16 ?!
maybe the difference cro v1/v2 ?
Click to expand...

Cromotor has M16 x 1,5mm thread pitch. usually M16 has 2mm pitch, so a normal nut from a "diy market" will not fit. I do not understand why the manufacturer doesn't put these nuts into the motor package. would only add a few $
If you have a solid clamping mechanism (i answer your pm soon), there is not really a need to tighten the axle nuts (only to have no wobble sideways) which means less stress on it. Less stress means the axle is capeable to stand more torque before it twist off in hard abuse.
 
Obiwan007 said:
One way you might get closer to your goal is to do what I did and get a Rennen front chain ring. http://www.rennendesigngroup.com/104mmBCD.html
They make them up to 52 tooth for a variety of crank styles including 104mm BCD 4 hole. Won't get you all the way to where you want to go but closer. I have considered the Schlumpf drive myself but I will try my current setup 16 X 52 first and see how I like it before I spend that kind of coin. It is too bad that the BMX freewheels won't fit our hubs. Obiwan
Click to expand...

a 52T with a 16T (rear) is 38kph with 90rpm...thats not really much....

2014-03-06_10h41_37.png


iam still waiting for a Price from Zelenavozila for a Schlumpf Drive.
atm i have no crankset, so the price for a schlumpf maybe only the half "on top" of a normal crankset. (hope so ;P)
 
madin88 said:
Cromotor has M16 x 1,5mm thread pitch. usually M16 has 2mm pitch, so a normal nut from a "diy market" will not fit. I do not understand why the manufacturer doesn't put these nuts into the motor package. would only add a few $
If you have a solid clamping mechanism (i answer your pm soon), there is not really a need to tighten the axle nuts (only to have no wobble sideways) which means less stress on it. Less stress means the axle is capeable to stand more torque before it twist off in hard abuse.
Click to expand...

That means when i order from Croatia a Cro i dont have 2 Nuts for the Motor ?! :shock:
 
Merlin said:
That means when i order from Croatia a Cro i dont have 2 Nuts for the Motor ?! :shock:
Click to expand...

right, and you will hardly find a store where you can buy such nuts. maybe you find on ebay or other online stores..

I would ask them in croatia if they can pack the nuts with the motor. say you will not buy it without.
 
thx....thats a priceless info. I remember my first ebike kit....chaos...somebody who starts building a diy ebike without knowing about freaking details is a real pita :mrgreen:
and stop to build of missing parts you need - > sucks....

thinking about your pm and this dropouts, maybe a buildthread would be funny :mrgreen:
 
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