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Stridas MkI

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Stridas MkI

Postby chaves pah on Sun Nov 08, 2020 1:18 am

Hello, my relationship with Stridas is very long now... my late brother had one he bought in early nineties, that "lived" in the trunk of his car, until he had a serious fatal car crash, and I never heard about the bike, just assumed it had been destroyed in the crash, as the car was heavily damaged; but after all I did find it some 15 years later in my mothers attic, wrapped with the belt... and, of corse the plastic STRIDA join was broken; That's when I found it was impossible to find spares to repair it... so I started searching in the Net to see if I could find some other bike, even broken but with the parts I needed intact, but I had no chance. One or two years later, I finally found a more recent Strida that already had a different (better) upper join, still in plastic I believe it is a Strida 2 in perfect condition, so the project of rebuilding my brother's was put aside, and I started using the Mk2, although I made a steel reinforcement to the upper join as I thought that, being both semi halves still in plastic... One year later I heard someone telling me that a guy in a near city had once bought a container with 50 MK1s, some in pristine condition!... Well, I found the guy at last, and by phone he told me he still had a complete one! well, when I saw it, there was a rack missing... so I asked him if there was the possibility for him to find it where he did store the bikes, and ten minutes later he appeared with another Strida, with rack but witout a sadle... In the end he sold me the second one for half the price, so I offered the Mk2 to my wife and started using a "brand new" Mk1!...
The problem is that Lisbon, where I live, is FAAAR for being a flat place to pedal, and quite soon I found a major weakness in these old Stridas: when pedalling, the crank cassette(not stiffly fixed) moves slightly ( and constantly) from left to right, and after some three or four daily use, the Flange that keeps the rubber belt in correct position in the rear pulley, where it is fixed by a 1mm thick edge that is pened 1mm over the flange, just jumps out! no more pedalling... by the manual you just have to pen it again ,it's very easy! but after three more months, this happens again, and when you pen that thing again... the poor edge is just cut in two parts and... no more Strida; as I had three wheels, I kept using the others, until the end. The crank cassette problem was to be solved in the Mk2, the two semi halves are now crossed by two M6 bolts trough the frame tube but, why didn't they keep the MK1 metal cassette and made it now in plastic??? the wobbling(?) movement when pedalling still happens, so the Mk2 is much less used, to avoid putting it also in the shelf... I was thinking about getting some mechanic to fix me the flange to the pulley with some bolts, that would have to be M2, there is no more space ( meanwhile I decided to buy 700 wheeled Specialized) , so the Stridas headakes vanished, until five years ago when I found an almost new 18" SX Strida! Now that is a real Bicycle!
I used to go to work everyday 12km but retired two years ago and as my family life changed considerably, I no longer pedal so frequently, but this year my daughter entered a university on the other side of the river and, with the pandemic, I am his private Uber so I have plenty of time for biking, so the SX is now making it's job again! uuhh... I found last week that the rear tire was veery near the end and, when trying to buy a new and better tire, these INNOVAs seem to be a little weak, I found that buying some tires for a Strida may be very difficult en the near future!
Schwalbe did make some alternatives, as the Kojak ,that my be also as weak as the INNOVAs, and the other alternative they made with the Strida wheel specs is now deleted! I had to buy a 18x1.50 as the 18x1,35 is no more... it seems I will have to make a little stock of these 18x1.50s before they stop making it also...
Can any one help me with some info about how to repair my Mk1s and the Mk2, as well as understanding why there is this problem with tires for STRIDAS?
Thank you very much
chaves pah
 
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Re: Stridas MkI

Postby Blackstridaaustria on Sun Nov 08, 2020 9:58 am

chaves pah! wrote:...why didn't they keep the MK1 metal cassette and made it now in plastic???


You may have noticed that the first "cassettes" were manufactured as a directly connected part of the hub which means they could not be replaced!
So, under that angle of sight, are the newer - separable - pulleys anyway a big step forward compared to the initial version.
Likely it was not the best idea to use plastic and it seems that Ming cycle recognized that, the following version was made of metal.

chaves pah! wrote:Can any one help me with some info about how to repair my Mk1s and the Mk2, as well as understanding why there is this problem with tires for STRIDAS?


Sorry to say that, but nowadays it seems impossible to repair these old bkes properly - simply because most of the spare parts are not any longer in production!

The Strida tyre issue was caused mainly by selecting a gernerally rare rim size for the 18" wheels - the ETRTO size 355 mm. Less manufacturers are using that size, as fas as I know it is just the German R&M Birdy and the Japanese Iruka folding bike.

It would have been much better to use instead of 355 mm the 349er size, that is equal to the Brompton's rim size and there is far more tyre choice.

Yes, it is correct that Schwalbe discontinued the tyre size 35 - 355 several years ago, when I complained back then they said:
"Oh sorry, we didn't have the Strida bike at our screen!"
:?

I mean there is just one way to solve the issue - switching to 349 mm rim size.

Image

Did that already at my efneo Strida:
Image

...and btw, there are odd things possible by switching rims:

Image

Image

Image

:lol:
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Re: Stridas MkI

Postby chaves pah on Tue Nov 10, 2020 6:31 pm

Hi, Blackstridaaustria, thank you very much your quick answer! well, I took some pictures of my Strida 2(?) to confirm I am correct but still did not discover the path to post it, so in meanwhile I found that one of the two Mk1s is model nº13991 while the other lost it's identifying sticker, although it may surely have the same "age"; the other I name STRIDA 2 has a metal sticker strip showing nº 000806; it is metalic silver with a grey plastic cranck "cassette", beltwheel (pulley) and upper join halves with black SRIDA logo; whells are also grey, and i found that, as Mk1, the handle barT is also made of steel tube; for the first time the British Flag gave way to a strida.com logo... already made in china?
With the broken bike cassette I tried to replicate the more complex function system used with the Plastic Mk2 cassette, but (may be because I do not have enough precision tools) altough it seems to be firmly fixed to the tube frame, when I pedal as I would when climbing, i can clearly see the cassette moving some 10 or 15 mm from each side of the verical position,so the rear pulley flange is doomed, if I do not get a solution... So, I have been sketching (CAD) two similar solutions, for two very different cassettes (bottom bracket castings, easier calling it cassettes, isn't it?): a rectangular welded aluminium (minimum 6mm thick) "fin", crossing vertically the tubular frame and entering as much as possible inside the cassette from where a male rod gets out enough to get the nut that allows correcting the belt tension; the two horizontal bolts that cross the plastic cassette to fix it after correct belt tension, will have to be replicated in the older metal cast cassettes; In the plastic cassettes the "bee nest" reinforcements have to be "filled" to accommodate the new fin, while in the hallow metal ones some transversal reinforcements, two or three will have to be done to help strength... what do you think about it? these parts could be eventually laser cut, in all a way to put these vintage Stridas out there... if possible, I could send you my Stridas images and the CAD drawings (they are almost done), that you could post or insert in my reply post...
chaves pah
 
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Joined: Thu Aug 09, 2012 1:05 pm
Location: portugal

Re: Stridas MkI

Postby chaves pah on Wed Nov 11, 2020 1:28 am

Image
Well... this is the only image I uploaded successfully here... I have some more in flickr, in an album called STRIDA chaves pah; I can not find it's IMG CODES!... can you help me, Blackstridaaustria?
chaves pah
 
Posts: 3
Joined: Thu Aug 09, 2012 1:05 pm
Location: portugal

Re: Stridas MkI

Postby Blackstridaaustria on Wed Nov 11, 2020 3:18 pm

Sure, if I can...don't hesitate to contact me :wink:
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"Who knows nothing, must believe all." *

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