Destroyed! A warning to those using freewheel cranks....

[Solcar]

Boostjuice, thanks very much. I enjoyed the exhibit. Great information, I'll look out to obtain the ACS crossfire.

[MitchJi]

Hi bj,

Any chance of fixing the links or reposting the pictures?

You can all decide for yourselves.....amongst other choices


...

By chance, I happened to save all those when I saw them, as I am considering modifying some existing freewheels with certain features I saw on those (which I expect to fail but still may try).

Attached below, not necessarily in the same order they used to be:

Thanks Amberwolf!

[amberwolf]

By chance, I happened to save all those when I saw them, as I am considering modifying some existing freeewheels with certain features I saw on those (which I expect to fail but still may try).

Attached below, not necessarily in the same order they used to be:

[boostjuice]

Yeah sorry guys. I just changed ISP, and the new one is taking forever and stuffing me around with my new FTP webspace setup. AW saves the day in the meantime

[myzter]

How to help...
mount a large chain ring 40T+ to the Acs Crossfire 16T FW ?
what do I do or need to buy ??

[comradegerry]

I just picked up a Tensile Onza 60 click from Ebay to experiment with...

It has dual bearings and looks to be decent build quality, I plan to grind off the cog and get somebody to weld on a flange similar to the WI ENO type....

Would this work for a through the crank setup, moderate power, is it even worth trying or am I best sticking to the flanged ENO I currently have installed?.

I will post up some pics of it opened up when it arrives for the curious.

http://www.ebay.com/itm/260910437496?ss ... 1439.l2649

[recumpence]

Hey Guys,

I just wanted you to know I am developing a freewheeling crank setup that uses a second support bearing to solve this problem and will accept normal 130mm BCD chainrings. I expect to have them in stock in about 30 days.

I am sorry to hijack the thread. But, I thought you might want to know.

Matt

[fizzit]

Cost estimate? Or if I have to ask...

[recumpence]

Cost estimate? Or if I have to ask...

That depends on what you are looking for.

The bottom bracket requires a longer spindle for room for the second bearing. So, it requires a bearing, lengthened bottom bracket, bearing spacer, sprocket adaptor, crank arms, chainrings, and freewheel. The freewheel can be a basic flanged freewheel or a White Industries flanged freewheel. I would guess it will be maybe $250 or $300? I have to total up all the parts that go into this and get back to you.

Matt

[comradegerry]

Hi Matt

That sounds real interesting look forward to seeing the idea develop into another cool must have product.

Best wishes for Christmas and New Year.

Gerard

[Miles]

Another way to do it:

[Miles]

An axial thrust bearing on the outside is also a possible solution. I'll model it up when I have a moment.

[daveyjones97]

i havent read the thread thouroughly as its late here, but im going to make an ebike using the rear disc brake hub mount to mount the drive sprocket for the motor. the disc brake can either be swapped for a v brake or relocated to the motor shaft. are there any major disadvantages to that? the fear of freewheel failure in town traffic or a fast downhill makes me want my mummy.

[Miles]

So, where will you have the motor freewheel?

You could move the disc brake to a jackshaft, if the freewheel was on the motor shaft (or on the motor side of the jackshaft).

Obviously, the freewheel can't come before the disc brake

[Miles]

I see ACS are advertising Crossfire Pro freewheels, now:
http://www.acsbmx.com/crossfire.html


"Crossfire Pro Freewheels

Our best freewheels for uncompromising performance. CNC wire pawls and steps for the ultimate precision. Each pawl engages 2 steps for maximum grip. 60 steps for engagement every 6 degrees. Nickel-plated sprocket ring.

3/32" x 16T or 18T"

[Miles]

Need to get a specimen of these for the museum, boostjuice. They're about the same price as the ACS Crossfire.

http://www.excessfreewheels.com/



Ref: http://bmxmuseum.com/forums/viewtopic.php?id=393652

[Miles]

Also: http://www.gtbicycles.com/2012/parts/mi ... -freewheel



[Looks like it was made by the same factory as the Excess...]

[MotoMel]

We had ACS make up a batch of custom flanged freewheels (based on Crossfire) with 5 threaded 5mm holes and 5 unthreaded holes for 5mm screws, so that you can attach unthreaded or threaded chainrings to them. That makes them pretty versatile. If anybody is interested, we can put them up in the for sale area. Here are a couple of photos:

[Miles]

If anybody is interested, we can put them up in the for sale area.

Thanks Mel. I think there would be quite a lot of interest in those....

[Chalo]

Idle pedals are the devil's treadmill. Hard connect your pedals to your motor drive and all this nonsense becomes irrelevant. Or else continue to reap the wages of moral cowardice!

Chalo

[CNCAddict]

Do these have the same dimensions as the white industries freewheel; hole locations etc?

[MotoMel]

Hi CNCAddict. Are you asking about the custom ACS freewheels?

Hole location is the same, and the units are interchangeable. The White Industries freewheels are slightly thicker if I recall: wider and maybe even taller shoulders by .5mm or so. The ACS might have a partial mm taller flange; the ACS flange is just barely taller and barely thinner than Dicta. Is that any help?

[CNCAddict]

Yeah, that's the one and thanks for the info. I'd be interested in picking one up depending on the price

[MotoMel]

Price $15 plus about $5 for shipping. Does that work for you?

[boostjuice]

Need to get a specimen of these for the museum, boostjuice. They're about the same price as the ACS Crossfire.

http://www.excessfreewheels.com/



Ref: http://bmxmuseum.com/forums/viewtopic.php?id=393652

My std Crossfire is holding up great after ~500km so i dont see a need to find a better alternative. Smaller engagement increments doesnt help any either. That being said, I suspect they're going to be made to even tighter tolerances and feature a stronger engagement system being that their ratchet design takes a lead from Industry-nine freehubs.