Long Term testing of an ATS Speed Drive

[Alan B]

The high speed drive is a lot more expensive than the ATS, and takes special chainrings. I suspect the gears are not as strong, but that's an estimate. The ATS takes standard chainrings and gives a good ratio. If I remember correctly it came out 12/20 mph on my Greyborg setup which is not quite rolling yet...

If you want to pedal at 12/30 then the high speed drive would be needed.

[Quajochem]

I want one! The cheap one, right now I can paddle comfortably upto 35km/h, but I want to be able to do that @ 50km/h
So a 50% increase is more than enough for me

To combine it with my front 6T mac, nuvinci rear, 38/16T 26"

[BATFINK]

What is the benefit of these over a standard chainring?

Sent using Endless-Sphere Mobile app

[Alan B]

They give 2 speeds without a derailleur, and they fit where a larger chainring won't.

[BATFINK]

Cool, but what sort of hearing would you get with them, if for instance it was smaller than my 52t chain ring what use would it be at higher speeds?

Sent using Endless-Sphere Mobile app

[Alan B]

The planetary gearing inside multiplies the chainring effective diameter and tooth count by 1.65 for the speed drive and 2.5 for the high speed drive model. That's a pretty large chainring! That's the high speed gear, it goes to 1:1 normal size in the low speed setting.

[Sacman]

I haven't seen it mentioned yet on this thread but there is another option that is the Hammerschmidt Crankset by Truvativ. It is about as expensive and as robust as the Schlumpf Drive. It has the 1:1.6 gear ratio but doesn't come in 1:2.5 ratio. It also differs in that shifting gears on the Hammerschmidt is done by a cable and a thumb shifter on the handlebars, instead of kickplate button on the crank.

Another concern is just how rugged are these cranksets with internal gears. Are they just for the smooth pavement or can they withstand the jarring shock of offroad riding? I have read good success experiences from both Sclumpf and Hammerschmidt on the mountain bike forums. The comments in general are that yes both cranksets are expensive but seem to take the punishment from offroad pretty well.

One last observation is that when pedaling the Hammerschmidt with the 1:1.6 OD engaged there seems to be a slight whirring feel and low sound from the crankset but no noticable drag or loss in power was percieved.

[MattyCiii]

ebikessf will loan out the tool with a deposit of $350. That may be with the purchase of a Schlumpf, but they may accomodate you.

There is also a video of how to do the chamfering... looks pretty easy to me.. kind of like sharpening a pencil.

http://www.ebikessf.com/schlumpf-hs

Thanks Caspo6,
I just rented the install tool from ebikessf (placed the order); ETA this Friday. I'll have it for a week, plenty of time to chamfer the three bottom brackets I plan to install the ATS drive on. I'll post pix here and describe the install. Now more hurdle hopefully cleared soon!

[MattyCiii]

OK, so I got the tool set from ebikessf.com, and I used the chamfer tool to begin setting up my "standby" bike. I have pictures I'll post soon. A word of caution for those going down this path: The ATS version's minimum width is about 68mm. Once I chamfered down my BB, I could not tighten down the ATS drive for lack of width.

So to solve the problem I've ordered a 4mm spacer cone from Utah Trikes. Other spacers (e.g., 2mm) are available from www.cyclemonkey.com. See here for pictures:
http://www.haberstock-mobility.com/en/products/schlumpf-drive/schlumpf-downloads.html?file=assets/theme/content/images/schlumpf/Schlumpf-PDFE/Installation-Schlumpf-Speed-Drive.pdf

[Quajochem]

Hey guys, I contacted ATS 2 weeks ago but they didn't reply, anyone else tried to order from them in the last 2 weeks?
sales@ats-speeddrive.com

[MattyCiii]

Send a PM to Accountant. He was very helpful and responsive to my purchase. I received my order in like 8-10 days if I recall correctly, not bad for international shipping.

[Quajochem]

Thanks! Will do that, I'll report on the progress

[Quajochem]

Send a PM to Accountant. He was very helpful and responsive to my purchase. I received my order in like 8-10 days if I recall correctly, not bad for international shipping.

One more question; is Accountant a seller at ATS, or did he just buy one?

[Quajochem]

Dimitri (forum member Accountant) sells one with 1.6 ratio for a very good price, it is the one that they use on the Greyborg. Not the real Schlumpf, yet very good quality for a fraction of the price.

o I see..... contacted him

[Alan B]

ATS makes a licensed version of the Schlumpf. Accountant sells them.

[markobetti]

ATS makes a licensed version of the Schlumpf. Accountant sells them.

Exactly

[gensem]

Where can I find chain ring and cranks?

ATS itself does no reply to emails.

[Quajochem]

I had the same problem, but you can PM Dimitri (forum member Accountant). Because he bought 50 drives, and still has some left I just ordered one from him with cranks
The chain ring is standard, you can order that anywhere..

[MattyCiii]

Yes the chainrings are 130mm BCD

EDIT: WRONG! They're 110mm BCD. Keep reading this thread...

[gensem]

I had the same problem, but you can PM Dimitri (forum member Accountant). Because he bought 50 drives, and still has some left I just ordered one from him with cranks
The chain ring is standard, you can order that anywhere..

Hes is name is Vladimir!! I already got two ats drives from greyb.org, but now I need the crank arms and rings.

[gensem]

Yes the chainrings are 130mm BCD

ATS says the chainring is 110mm, have you got a 130mm installed in yours?

http://ats-speeddrive.com/tpl/all_sd_item.html

[Quajochem]

Sorry I thought you ment the ring with the teeth on it, or chainwheel, you are talking about the protection ring?
My order hasn't actually arrived yet, I think I ordered no protection ring or chainring at all, because I am planning to use it with a standard chaincase wich I will modify..


The number of teeth will be 38 or 40, I don't know how much that is in diameter.

[Quajochem]

But the chainring and chainguard are both standard 5 hole bolt on items, so there's no need to order them from ATS

[melodious]

This may be of interest for a chainguard. I saw it at my local bike store on folding bikes (Dahon). Its a plastic coil conduit with a split in the middle. Looks cool in person.

http://www.chainrunner.de/index_en.html

Went and surfed around for it and it may lack any real durability factor. Who knows. But it definitely adheres to the "simple looks" of this thread.

[gensem]

But the chainring and chainguard are both standard 5 hole items, so there's no need to order them from ATS

Regular chainring has BCD 104mm and regular crank arms do not fit too.

So... where to get the cranks and the chain ring?