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18" Wheel Upgrade: not that easy...

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

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Re: 18" Wheel Upgrade: not that easy...

Postby Googleg on Sat May 28, 2011 7:52 pm

Finally today I took the time to tighten my belt...

It was really hard to unscrew the black bolt, but once done I used a hammer to adjust the tension. Not the best way probably, but it worked fine.

Note that I really have little margin left should I need to tighten it further...

Image
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Re: 18" Wheel Upgrade: not that easy...

Postby Blackstridaaustria on Sat May 28, 2011 8:59 pm

Googleg wrote:Not the best way probably, but it worked fine.


Yes, it would be better to untighten the big groove nut a little before adjusting.
But, like most of all Strida users, you do not own a 60 mm ring nut key (the big one with three holes shown in the middle), I guess.
Image
Maybe you should email your fellow countryman, Mr. Schlumpf.
http://www.schlumpf.ch/
It might be possible he sells one separately. :D

For belt tension adjusting it might be useful to insert a 6mm drift punch into the belt extension bolt bore, like shown below:
Image
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Re: 18" Wheel Upgrade: not that easy...

Postby Bietrume on Mon May 30, 2011 6:54 am

Hi, I recently bought the Schlumpf Speed Drive but ordered the 'maintenance tool set' instead of the 'installation toll set', meaning that I did not receive the big ring nut wrench. Fortunately, I managed to unlock the big groove nut with a wrench coming from an old BMW motorbike tool set and which is used to adjust the spring preload of the rear shock absorbers.
It is similar to this one:
Image
So, if you need one, ask to your friends who own a motorbike or buy one at a motorbike shop (ask for a shock wrench).
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Re: 18" Wheel Upgrade: not that easy...

Postby Googleg on Mon May 30, 2011 7:08 am

Well, in my case I managed to do it without this tool, at the price of having some small marks left on the frame, no big deal.

Now the bike is behaving like normal, no more belt slipping when setting off in the traffic for example.

Next step for me will be to install a kick stand... :D
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Re: 18" Wheel Upgrade: not that easy...

Postby Blackstridaaustria on Mon May 30, 2011 10:03 am

Bietrume wrote:Hi, I recently bought the Schlumpf Speed Drive...


Congratulations to the new Schlumpf user!
Just a few days ago, a Schlumpf speed drive was ordered for my second, silver Strida 8)
At the moment I'm printing the installation manual for workshop use :D
http://www.schlumpf.ch/hp/handbuecher/WHB.sd.engl.pdf

Googleg wrote:Next step for me will be to install a kick stand... :D


Looking at strida suisse I would say their prices are...mmm...fascinating? :shock:
http://www.strida.ch/
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Re: 18" Wheel Upgrade: not that easy...

Postby Googleg on Mon May 30, 2011 10:19 am

Blackstridaaustria wrote:Looking at strida suisse I would say their prices are...mmm...fascinating? :shock:
http://www.strida.ch/


Well, everything is more expensive in Switzerland, and here most people are used to pay big price for their bike which they use for their daily commute.

Check the prices of the Vanmoof bikes here, it's the same: http://www.vanmoof.ch/

I think however that strida.ch should adjust the prices to take into consideration the huge appreciation of the CHF against the other currencies.
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Re: 18" Wheel Upgrade: not that easy...

Postby Googleg on Tue May 31, 2011 8:22 am

I've just ordered the kick-stand, after that the next customization will probably consist in trying to arrange the fenders by heating them gently with a hair dryer...

Then I would like to see if I can put the cranck hub in a lower position to save some space for my knees. I sort of remember having seen someone on this forum that did completely invert the position of the cranck, not sure if this would require me to drill a hole for the bolt though.
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Re: 18" Wheel Upgrade: not that easy...

Postby Blackstridaaustria on Tue May 31, 2011 7:07 pm

Googleg wrote:I sort of remember having seen someone...

http://www.stridaforum.com/forum/viewtopic.php?f=4&t=3037#p5235
Guess you meant Amuro's post above?
Good idea by Human Amp, but there might be a disadvantage, maybe a special problem which could be different from Strida to Strida. :!:

Here we have the, let's say, "down" side of the crank hub,
the thread of the kickstand/belt tension bolt is visible shifted to the right.

Image

and here the "up" side:
Image

Clearly visible, here is a second thread.
But the positions of the threads (around the circumference) are not exactly vis-a-vis (180°).
The angle between the two threads is in fact about 120° (or 240°- your choice :-)).

What does that mean?

First: PLEASE BE WARNED: The, originally supplied, longer kickstand/belt tension bolt might be too long - please beware of damaging the crank shaft!
This might also apply by using the normal, shorter belt tension bolt without kickstand!

Second: Due to the different angle of the thread, the kickstand becomes a different angle to the frame and - might collide with mudguard and tyre :?

Image

For this reason I reversed the modification.
Pic above arranged for explanation.
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Re: 18" Wheel Upgrade: not that easy...

Postby Googleg on Tue May 31, 2011 8:03 pm

Wow, that is very very interesting, thanks for sharing all that !

It's better to think twice then, because the modification has some serious drawbacks. :? :?
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Re: 18" Wheel Upgrade: not that easy...

Postby Blackstridaaustria on Tue May 31, 2011 8:33 pm

As said, I am really not shure if this behavior applies to all Stridas.
I think it is worth a try in any case.
Trying the whole thing with Schwalbe Marathon, I could imagine it works with Kojak's :)
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Re: 18" Wheel Upgrade: not that easy...

Postby farastein on Fri May 31, 2013 4:48 pm

I am having a lot of difficulty in tightening the belt... Frm what i understand, i will just need to loosen the C ring and then turn the screw.... But my screw in the slot seems to be lost after a session of riding. What shld i do? I have seen some of us who inserted things into the hole and hammering it. May i know how i may do that? Which direction do i hit?
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Re: 18" Wheel Upgrade: not that easy...

Postby Googleg on Sat Jun 01, 2013 7:30 am

Hi Farastein,
Here is how I do to tighten or loose the belt/chain.

First, I unscrew this bolt so that approximately half of it is visble:

Image

Then I try to "gently" hammer it on it side, protecting its thread by putting a small piece of wood between the head of the hammer and the bolt.

That way I can move it it any direction to either tighten or loose the transmissiom belt.

When finished just tighten the bolt as hard as you can. You need a hex key that is long enough or that has a handle so that you can apply enough torque.

Hope I was clear enough.
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