Hub Motor width

[Doctorbass]

Hello all,

Before i finally order my X5 hum motor, i would like to check the minimum spacing required so the hub motor doesn't contact on my front fork. I measured 4.0" between the dropouts (at the axle) the spacing and 3" between tubes of my rock shox suspension

I havent succes on searching on crystalyte site for that info.

I need help :lol:

Thanks

Doc

 

[CGameProgrammer]

You do not want to put the X5 in a suspension fork; it could snap. Those aren't designed to handle the lateral forces the motor would apply.

 

[eP]

You do not want to put the X5 in a suspension fork; it could snap. Those aren't designed to handle the lateral forces the motor would apply.

Maybe strong suspension fork a la chopper could be strong enough ?
It is also could be possible to use smaller rim at front (20'') at that case.

 

[Lowell]

Any fork that's designed to handle an 8" disc brake will be fine in terms of bending, just make sure to take the load off the dropouts with a torque arm.

 

[Doctorbass]

You do not want to put the X5 in a suspension fork; it could snap. Those aren't designed to handle the lateral forces the motor would apply.

Well... i was sure that a rock shox could be enough strong to handle that torque...


In that case, would you suggest me to use a rear hub motor ?

I absolutly want to get a X5 like 5303 or 5304 they are strong, seems to dissipate heat better the others hub motor and can take big current and volt even if i would like to do some test on it...

Who here use X5 front hub motor ?..

What could you suggest me?

Thanks guys!

 

[deecanio]

i dont have an x5 but i would advise you to go with a rear wheel setup over a front every time - either way doc get some torque arms on it, just to be on the safe side.

cheers

D

 

[29a]

I don't have an X5 either but I would be curious to know which supplier hasn't advised against an X5 in a front
The 400s front immediate start over 20A will easily rip out drop outs + snap/bend suspension forks over time + IMO shouldn't be used without a serious torque arm, the X5 is alot more powerfull

 

[Doctorbass]

I have no problem about using a rear hub motor, but if the battery are placed on a rack mounted at rear of the bike, the weight would not be balanced correctly right?

By using a front motor, and battery rear or center of the byke triangle, that seems to be balanced correctly..

Well i can imaginme the bolt of the X5 motor to damadge the folk when applying suffisent torque, but when people say that can bend the folk tube.. i am septic...

And about use of torque arm?.. would it be possible front X5?

Any of you ever experienced bending of folk??

I seen this interesti ng article:
http://www.users.bigpond.com/solarbbq/torquearmsandwashers.htm

Doc

 

[Drunkskunk]

Sit on a suspension forked bike, apply the front brake only, then rock back and forth on the bike and watch how much the front fork flexes. it should by several inches on your average RoxShox. thats a couple dozen watts of pressure, now imaging what will happen with 2000 watts forcing against it.

Once you sit on a bike, you've unbalanced it. your weight is primaraly over the rear wheel. And by the same token, adding the motor and battery to the rear does unbalance it, but not by any real tangable amount. you'll notice more from having the batteries up high than you would from being to the rear.

 

[CGameProgrammer]

I'm currently using a rear 5303 and I have about 40 lbs of batteries in a rear basket directly over the rear wheel. Yet weight balance does not appear to be a problem. The front wheel has plenty of weight on it when I'm sitting on the bike, and I'm only 150 lbs. The suspension fork gets compressed noticeably.

 

[Liberator]

I specifically bought a bike with a steel non-suspension fork for my 48V Racer (5303?) and have a torque arm on it. Was concerned about having a rear hub as the frame (not the fork) is aluminum and I'm already adding 220lbs to the bike from my own weight (I'm 6'1") and then SLAs on top of that.

I check the fork dropouts all the time but am still concerned I made a bad choice. It's a decent quality bike (Trek) and not a $59 Walmart jobber at least. Hope I'm not pushing my luck. Don't right it hard or hop curbs as it's a shopping/commuter bike but still....

 

[Lowell]

Docterbass: What diameter is your fork?

 

[Liberator]

You do not want to put the X5 in a suspension fork; it could snap. Those aren't designed to handle the lateral forces the motor would apply.

Well... i was sure that a rock shox could be enough strong to handle that torque...


In that case, would you suggest me to use a rear hub motor ?

I absolutly want to get a X5 like 5303 or 5304 they are strong, seems to dissipate heat better the others hub motor and can take big current and volt even if i would like to do some test on it...

Who here use X5 front hub motor ?..

What could you suggest me?

Thanks guys!

Hey, is this what you're looking for as far as dimensions? http://www.electricrider.com/crystalyte/motordimensions.htm

 

[Lowell]

My X503 is 95mm wide at the side covers between the dropouts, and 85mm wide at 1" in from the spoke flanges. Apparently the 503 is wider than a 5303 and can handle more power, which could partially explain why my bike is so fast. 92v @ 80 amps could be the other contributing factor.

 

[Doctorbass]

Wow.. alot of help here! 8)

Thnaks guys, I have now a good idea about that.

If you agree that to have battery + motor placed at rear of the bike is not a problem, i would prefer that too.

I seen 5304 front version on ebikes.ca where i would like to buy my entire kit soon.. (if better price for Canada buyer let me know)
part no :M5304F26 at: http://www.ebikes.ca/store/

The rear is only 25$ more pricy.

LOWELL, What is the diff between 503 and 5303 ? i never heard about 503...

LIBERATOR, the link you gave, does'nt indicate the width needed for the shaft.. but only the width for the motor cover.. but thanks it could be helpfull,

My bike is a old chromoly TREK 970 with 26" weel. (sold in the beginbibg of 90' i believe, abd the folk is a quality rock shox with 4 inch availlable for the shaft and 3" for the motor.

I now have a good idea about the torque that this "beast" can deliver.. and i understant why every owners talk about torque arm...

Doc

 

[Lowell]

The 50X hubs only have room for a single speed freewheel inside a 135mm dropout, which is probably why they are not as popular. I've never compared it side by side with a 530X, but from the dimensions above, my motor is definitely wider.

 

[Liberator]

LIBERATOR, the link you gave, does'nt indicate the width needed for the shaft.. but only the width for the motor cover.. but thanks it could be helpfull,

On another part of the site it says: "The axle is 9mm in diameter".

 

[Doctorbass]

LIBERATOR, the link you gave, does'nt indicate the width needed for the shaft.. but only the width for the motor cover.. but thanks it could be helpfull,

On another part of the site it says: "The axle is 9mm in diameter".

Thanks for your effort. Maybe it's my english that is not so good to explain detailed info in my questionning.

I am talking about lengh of the shaft that would fit in the 4" width i have for my folk.. not the dia of the bolt on the shaft (like the 9mm you said)

On the site they only indicate the width of the motor not the shaft that fin between folk arm...

Doc

 

[Liberator]

Thanks for your effort. Maybe it's my english that is not so good to explain detailed info in my questionning.

I am talking about lengh of the shaft that would fit in the 4" width i have for my folk.. not the dia of the bolt on the shaft (like the 9mm you said)

On the site they only indicate the width of the motor not the shaft that fin between folk arm...

Doc

No, your english is just fine. If I understand I think the answer is 100mm for front forks since they say on that link I posted, "All our motors fit a standard 100mm bike dropout for front, 135mm for rear." I would assume it's the same for the motors from ebikes.ca but you should certainly email them to be sure. I assume that is pretty much an industry standard but someone correct me if I'm wrong.

 

[Doctorbass]

Thanks, it's appreciate!

Doc 8)