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Has anyone retrofitted a schlumpf on their strida?

Advice from experienced owners on maintenance and repairs, riding skills and anything else.

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Re: Has anyone retrofitted a schlumpf on their strida?

Postby fwd-bwd on Mon Feb 01, 2010 4:31 pm

Andy B: Awesome mod! Mini owners are lucky that their crank arms are 5-bolt just like the Schlumpf SD. Us 5.x owners can't do the same unless we somehow manage to find a 5-bolt front sprocket to replace the existing 4-bolt one. :(
fwd-bwd
 

Re: Has anyone retrofitted a schlumpf on their strida?

Postby fwd-bwd on Sat Feb 13, 2010 5:29 pm

A quick update regarding the Schlumpf Speed Drive kit for Strida: I heard the first batch of the kit was almost ready. The delay of release was due to a redesign of clutch geometry. The change was deemed necessary to compensate for the higher tension on the belt (vs. a chain).

If the technical issue is indeed true, it helps to explain why Sports Duo has been produced in such a small quantity. But it may also raise a red flag on the durability of existing Sports Duos. :?:
fwd-bwd
 

Re: Has anyone retrofitted a schlumpf on their strida?

Postby fwd-bwd on Wed Mar 24, 2010 1:32 am

It IS here! Behold the Strida Speed Drive Kit:

http://www.schlumpf.ch/hp/schlumpf/news_engl.htm

The official price tag is 519 euros! Maybe it's to justify the cost or to deter people from buying ATS Speed Drive, Schlumpf made this statement:

"Please notice: the internal parts were modified in order to correspond with the higher proload of the belt compared with a chain. Always ask for the original Schlumpf speed-drive made in Switzerland!"

Image
Image
fwd-bwd
 

Re: Has anyone retrofitted a schlumpf on their strida?

Postby fwd-bwd on Wed Mar 24, 2010 4:04 am

On another Schlumpf webpage, I found the following warning:

"The belt drive speed-drive comes with a special geometry of the internals, which matches the requirements of the higher belt tension, compared with a chain. Never combine a standard speed-drive with a belt drive."

http://www.schlumpf.ch/hp/sd/sd_engl_preise.htm
fwd-bwd
 

Re: Has anyone retrofitted a schlumpf on their strida?

Postby hydra on Wed Mar 24, 2010 8:03 am

Does it mean that hte first Sport Duo Series are defectives?
Will Strida change the defective parts for free?

Best regards

Hydra
hydra
 

Re: Has anyone retrofitted a schlumpf on their strida?

Postby Ed on Wed Mar 24, 2010 2:53 pm

I'm thinking here that the belts don't have the slack and give that a chain has here which can probably stress out the intricate gearing they have inside. Those belts are very strong and don't stretch at all.
Ed
 

Re: Has anyone retrofitted a schlumpf on their strida?

Postby Guest on Wed Mar 24, 2010 5:21 pm

I thought with the snubber correctly adjusted (ie 0.5mm gap max, but not touching the back of the belt) .. that belt tension can be much lower - on par with a chain. Maybe Schlumph dont get this ?

The price seem high - the china made one appears to be much less - but only available on a new bike.
Guest
 

Re: Has anyone retrofitted a schlumpf on their strida?

Postby AlastairB on Thu Mar 25, 2010 11:00 pm

In their news, Schlumpf report availability of a two-speed front hub gear specifically for Strida. http://www.schlumpf.ch/hp/schlumpf/news_engl.htm.
They say "available from your Strida retailer". But my dealer (http://www.strida.nl/english/products.php) has no reference..?

For me, spending 400 Euros (or so) for 2 gears is too much for not enough, so I won't be bothering. But it's a useful link for anyone who wants to look further...? Please post here, if you go further?


It still baffles me. There's a huge volume available on the Strida; that whole area of the drive cog, below the crossbar, times the width of the pedal axle? You could get a load of big gears (lower torque, higher efficiency?), and axles and springs and bearings in there?

If this was a Dyson product, gears would have been available years ago....

(2 other pet modifications I have in mind:
- Folding seat. If it hinged below the front of the saddle, close in to the frame, to lie alongside the back strut... The whole bike would eat sooo much less volume.. The saddle would be mounted on a strut, which would be parallel to the ground when unfolded. This strut could be about 600 mm long.. And used to hang luggage off.. Which is much more efficient than a rack to stand luggage on?
- Wheeling the Strida folded? It's twice the pain it needs to be, because you have to hold it upright in two dimensions. One simple fix might be to buy a pair of Strida wheel magnets, and fit them to either end of a short flat bit of plastic, and, when folding, instead of clipping the wheels together, click each wheel to an end of the strut, making a "very short wheelbase Strida", that would be stable "front to back", and would only need supporting left/right. Immediately, you stop carrying the weight when wheeling it folded...)
AlastairB
 

Re: Has anyone retrofitted a schlumpf on their strida?

Postby Human_Amp on Fri Apr 02, 2010 11:16 am

I think the point of Strida is SIMPLICITY, and the design aims to be pure, clean, simple and Iconic. There are plenty of bikes with zillions of gears - but its interesting the fixie urban movement is also going simple 1 speed. I beg to differ about dyson products: yes they are highly innovative, and extremely well marketed, but the design style - with all the innards out on display - is not to everyone's taste - like seeing all your intestines and ugly bits on the outside of the human form :D

2 speed locally made Shlumpf geared Strida's are also slowly coming to market from Ming - they work out cheaper than buying a Strida and then adding the gear. But the gear upgrade direct from Shlumpf will be super quality swiss engineering.... I guess give them all time to get these to market - manufacturing, shipping and distribution is not as instant as the internet.

I saw a pic of a folding Saddle on a Strida ..sorry cant find: I think it was on a picture from Taipei show a couple of years ago: The seat folded down to be parallel with the tubes: yes it did make the bike slimmer at the top, but also more complicated - with big safety issues: if not locked could drop the rider and lots of finger traps.

The idea of setting the wheels apart when folded is interesting - But I have no problems with the stability of my folded Strida. The best tip (from this forum I think) is to roll the bike as vertically as possible - with most weight through the wheels, not the arms, this means hold by stem with a bent arm, Or: hold by the front of the saddle. I think, Having the 2 wheels together makes the folded Strida more easy to manoeuvre - in fact just like the Dyson Ball vacuum :D - we've all seen the adverts for, steering around furniture etc. :D
Human_Amp
 

Re: Has anyone retrofitted a schlumpf on their strida?

Postby Human_Amp on Fri Apr 02, 2010 11:24 am

Skywalker has a good set of pictures of what to expect to gradually come into the market from Ming-Cycles in the coming year from the taipei Show ...

http://tw.myblog.yahoo.com/Skywalker-St ... e?mid=2476
Human_Amp
 

Re: Has anyone retrofitted a schlumpf on their strida?

Postby RichardCoffey on Tue May 25, 2010 3:36 pm

Hi,

I recently emailed Schlumpf Innovations to inquire about a Speed-Drive for my Strida 5.0. They were very helpful, and promptly replied with a quote of 821 CHF (Swiss Francs) plus 82 CHF shipping to the USA, for a total of 903 CHF.

821 CHF is currently about 577 EUR or 707 USD, 777 USD with shipping to the USA.

That's higher than I expected. Has the price gone up from the 519 EUR quoted earlier in this thread, or is this currency fluctuation?

Richard
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Re: Has anyone retrofitted a schlumpf on their strida?

Postby Blackstridaaustria on Thu May 27, 2010 11:04 am

Dear Strida drivers, Dear RichardCoffey,

with kind agreement of Mr. Florian Schlumpf, mechanical engineer in Switzerland, I would like to publish parts of the conversation between Mr. Schlumpf and me a few weeks ago:

Me: "... as an enthusiastic owner of a Strida 5.2 I would be highly interested in where to get a speed drive and in knowing the costs of the precious piece. Sharp, possibly not really competent, tongues here in Austria claim the Strida MAS does not operate properly."

Mr. Schlumpf: "The sharp tongues are not totally wrong: years ago we made a licence agreement with a Taiwanese company.
Presently, these gear drives are mounted into the Stridas - unfortunately with little success since the quality leaves a lot to be desired. For this reason we decided to produce a tailor-made alternative including the excentric fitting for the Strida, which is now available and works faultlessly. However, with "made in Switzerland" and 5 years full warranty this part is also a little more expensive."

I received the following parts:

1. Speed drive and belt
Image
2. Tool set "maintenance"
Image
3. Info sheets, mounting instructions
Image
In my case, the price was exactly 553,27 Euro (speed drive plus toolset minus 4 % when paid within 10 days).
And praise the lord if you are NOT going to be charged for customs duty (in my country about 20 %). :evil: :shock: :evil:

To dismount the original cranks you will need something like this:
http://www.bbbparts.com/images/tools/btl14_normal.jpg

For further information the workshop manuals can be found here:
http://www.schlumpf.ch/hp/handbuecher/WHB.sd.engl.pdf
http://www.schlumpf.ch/hp/handbuecher/WHB.sd.dt.pdf

Not mounted yet, I will post some pics of the mounting soon, additional overview added below.
Image

Better quality here:
http://s769.photobucket.com/albums/xx33 ... rive%20HQ/
Best regards to all Strida riders!
STV@gmx.org
StridaTuningVienna

"Who knows nothing, must believe all." *

[* line from "Aphorismen"; Marie von Ebner-Eschenbach, Austrian poet, 1893]
[* book title; Werner Gruber, Austrian physicist, 2010]
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Re: Has anyone retrofitted a schlumpf on their strida?

Postby Ed on Thu May 27, 2010 3:57 pm

This is great new can you give us a review on your feelings riding with the upgrade after? like speed and hill climbing? I'm seriously thinking of this but the price keeps holding me back. It's like the price of a new dahon curve with the 3 gears, but then again that is not a strida. With the schlumpf it's putting it into brompton territory in pricing and both bikes are handmade so the quality is there.
Ed
 

Re: Has anyone retrofitted a schlumpf on their strida?

Postby Blackstridaaustria on Wed Jun 02, 2010 4:47 pm

Hi everybody,

here is a little "how to do the Schlumpf".

1, remove the bell, turn your Strida upside down, remove crank bolt and belt tension bolt
Image
2, remove the small conical part (using the bbl tool), insert crank separator tool, screw in as far as possible and detract crank
Image
Image
3, insert drift punch into thread of tension bolt, remove the big groove nut and pull the excentric fitting out
Image
Image
4, remove the brake, remove the belt roll and the wheel, unlock your Strida carefully and change the belts
Image
5, lock the bike, mount wheel (Loc!), belt roll (Loc!) and brake (Loc!), pull the Schlumpf in its new housing, fit the big black groove nut (do not tighten yet), and fit the belt
Image
6, mount the single crank and tighten the axle bolt (strongly), mount the gear shift button (and shiftplates), refer to:
http://www.schlumpf.ch/hp/handbuecher/WHB.sd.engl.pdf B-4, B-5
Image
Image
7, adjust belt tension, tighten the belt tension bolt and the groove nut, mount pedals - done!
Image

Better quality here:

http://s769.photobucket.com/albums/xx33 ... ting%20hq/

required tools:

-the Schlumpf tools
-Allen keys 4,5,6,8 mm
-socket wrench 14 mm with ratchet or similar
-cotter pin drive, drift punch 6 mm diameter o. s.
-crank separator tool (bblparts BTL-14 o. s.)
-bolt adhesive, thread-locking compound (Loctite o. s.)

depending on your crank separator tool:

-flat wrench 15 mm
-adjustable wrench or flat wrench 16 mm

If available, use a torque wrench to tighten the following bolts:

-brake bolts 8 Nm
-axle bolt 50-55 Nm
-gear shift button bolt 1,1 Nm

Never use any bolt adhesives or thread-locking compounds (like Loctite or similar products) on Schlumpf parts (axle bolt, gear shift button bolt, belt ring bolts)!

Always use bolt adhesives on Strida brake bolts, wheel bolts, belt roll bolts and some other parts (Loc!). Refer to Strida user manual:

http://www.strida.us/files/5-MiniManual.pdf

The procedure takes about two hours and the Strida weighs about 500 gram more now.

Stormy, rainy and ugly cold here, the driving review will take some time...

...is there anybody out there...
STV@gmx.org
StridaTuningVienna

"Who knows nothing, must believe all." *

[* line from "Aphorismen"; Marie von Ebner-Eschenbach, Austrian poet, 1893]
[* book title; Werner Gruber, Austrian physicist, 2010]
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Re: Has anyone retrofitted a schlumpf on their strida?

Postby RichardCoffey on Sat Jun 05, 2010 12:35 am

Blackstridaaustria,

Thank you very much for your posts. You have provided a wealth of information that will be very useful to all of us considering fitting a Schlumpf Speed-Drive to our Stridas, and your installation process photos prove that ''A picture is worth a thousand words''.

With good weather, I am looking forward to hearing about test-rides of your Speed-Drive Strida.

Richard
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