The Unofficial 'CroMotor' Owners Tech-Tips Thread

[gensem]

Neptronix, using the same 17 1.40 rim the 2.75 wouldnt fit in most regular bikes. But I wont deny it looks alot better with 2.75, looks really pushy.

My caliper is telling me that the 2.50 tires has 2.6inch diameter and the 2.75 tire has 2.90inch diameter.

[GCinDC]

[gensem]

Thats a really long drop out, I would dare to say too long, for the stuff i saw in your videos... but that was a reminder to be carefull with my catapult.

[zombiess]

Thats a really long drop out, I would dare to say too long, for the stuff i saw in your videos... but that was a reminder to be carefull with my catapult.

Just wait to you see what I have my friend fabricating for my exhibition of acceleration bike.

This is what I have now


Rides nice, corners great and that swing arm is extended 8 inches. Problem is I can barely run any phase amps into the motor at 125V because it doesn't matter how far I lean over the handle bars, it will loop me off on a hard launch. New version is most likely going to be 16" or 20" longer with a different shock mount so I can use a longer shock with a stiffer spring I already own vs this very nice 140mm Cane Creek Cloud 9 air shock so I can go hunting just about anything from a dead stop to about 50 mph Should be scary fun.

[fractal]

nice!!!!! can you provide any details???

[GCinDC]

dbaker is the man for details.

all i can say after testing it is:

and his old 24s pack was sagging hard.

[patrickza]

Thats a really long drop out, I would dare to say too long, for the stuff i saw in your videos... but that was a reminder to be carefull with my catapult.

Just wait to you see what I have my friend fabricating for my exhibition of acceleration bike.

This is what I have now


Rides nice, corners great and that swing arm is extended 8 inches. Problem is I can barely run any phase amps into the motor at 125V because it doesn't matter how far I lean over the handle bars, it will loop me off on a hard launch. New version is most likely going to be 16" or 20" longer with a different shock mount so I can use a longer shock with a stiffer spring I already own vs this very nice 140mm Cane Creek Cloud 9 air shock so I can go hunting just about anything from a dead stop to about 50 mph Should be scary fun.

How have you guys managed to mount your disc breaks? With my bb7's and 203mm rotor there just isn't any clearance for the inside of the caliper...

The way I see it I have two options. Either use a spacer, or try to find a 10inch rotor. I like option number 2 more, anyone know where I can buy a 10inch rotor?

[Alan B]

The local hardware store has 10" rotors. They have a little extra material you need to remove. Check in the table saw aisle.

[hillzofvalp]

I'm thinking about water jetting my own disc if I run into this issue. will any faced 1/8" stainless do the trick with enough support?

[zombiess]

My 203mm rear fit fine with my Hayes Trail but it's really close. All my stuff is done custom, probably not as much issue on a normal bike. Avid Juicy calipers are much smaller.

[Lavolta]

Here is CroMotor number 9 laced into an excell 19" rim.

I was planing to only use a 180mm rear disc with Hope 6Ti caliper but it is too wide.

DSC_0202.jpg

(92.38 KiB) Downloaded 7 times

Cheers
Bruce

[andreym]

If you have only 135mm of dropouts and still want to fit some torque arms inside, you can use the following disk rotor adapter mod:
-remove original adapter,
-get avid g2c2 203mm rotor
-get magura gustav M rear brake for enough clearance
-dremel a bit of avid rotor to make it fit and screw it up INSTEAD of original adapter

here is your additional ~5mm clearance for torque arms with CroMotor and 135mm of dropouts!
and some pics:

[MadRhino]

Here is CroMotor number 9 laced into an excell 19" rim.

I was planing to only use a 180mm rear disc with Hope 6Ti caliper but it is too wide.

DSC_0202.jpg

Cheers
Bruce

Nice wheel, have you measured its weight, complete as shown?

[gensem]

he is using thin spokes... so I would guess around 14-15kg

[MadRhino]

he is using thin spokes... so I would guess around 14-15kg

He's using heavy rim and tire, I would guess more than that.

[hillzofvalp]

spokes weigh nothing...lol maybe 1-2 pound difference

[MadRhino]

spokes weigh nothing...lol maybe 1-2 pound difference

Seem little, but if you consider the difference of force required to accelerate (and brake) a heavier wheel, 2 pounds of extra wheel weight means a lot of performance loss. Then, the further the weight difference is from the axle, the greater the performance loss. 2 pounds of tire eats more watts in acceleration, than 2 pounds of spokes.

[gensem]

I dont think 2kg of spokes (and thats what 36 thick spokes weight) are nothing.

[Gow864]

He's using 9g spokes.

he is using thin spokes... so I would guess around 14-15kg

[gensem]

the spokes look so thin in the pictures... based on that the wheel is definitely over 15kg

[fractal]

Does anyone know if the color combinations of the motor match the Lyen controllers? Zombiess, can you confirm this?

[zombiess]

Does anyone know if the color combinations of the motor match the Lyen controllers? Zombiess, can you confirm this?

Should be color to color, phase Y-Y, G-G, B-B, Hall Y-Y, G-G, B-B but there are two other working forward combinations as well

[hillzofvalp]

What are you using to hook up those big drilled phase leads? Termination blocks of a sort? Care to share?

[zombiess]

What are you using to hook up those big drilled phase leads? Termination blocks of a sort? Care to share?

Personally I cut mine off because the leads were way too long for my bike (trimmed about 18" off). I then used the spade connectors I bought from Lyen that he uses on the 18 and 24 FET controllers for phase and power (I ordered a few spare sets from him on my last purchase). They seem to work great. Only downside is if you connect and disconnect the male connector enough it tends to weaken and wants to break, I noticed this since I was doing a lot of work on my bike because it's a test mule and often have to swap wires to find phase / hall combos. The solution to fix it was simple, add more solder to the lugs where they were stressed connecting the little tab pop up to the back side where the wire is soldered on. Takes about 1-2 mins per connector if already installed on the bike and does not interfere with the operation of the connector at all. I now do this during a build to make sure I never have to worry about it breaking off and they become much much stronger. I'm a fan of simple solutions. Ever since I've done this very simple fix, no more problems and they have been connected and disconnected many times.

My Harbor Freight Chicago electric 180W soldering iron is the bomb for this kind of work as it only takes seconds to melt giant blobs, all for $15
http://www.harborfreight.com/180-watt-industrial-soldering-gun-4328.html

Most of my irons are radio shack brand, some older than 20 years I bought as a kid and are still going strong. One day I'll finally break down and buy a "good iron".

[gensem]

You also have the option to use XT150 connectors from HK.