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PostPosted: Thu Apr 09, 2015 7:06 pm 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider

Joined: Thu May 06, 2010 10:05 pm
Posts: 7480
Location: Aberdeen
Cool, find a cheap beat up fork to test out your theory, although from that third pic it does look like the fork has bent inwards slightly. A bit worrying !


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PostPosted: Thu Apr 09, 2015 10:39 pm 
Retro Guru

Joined: Tue Oct 23, 2012 10:52 am
Posts: 468
Location: Whelmington on Sea
:shock: Noooooooooooooooooo :!: . Don't mess with it, sell it :D . Its really easy to find out what is bent. all you need is a plumb line to check the vertical & also the tracking.


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PostPosted: Fri Apr 10, 2015 12:50 am 
Dirt Disciple

Joined: Wed Apr 08, 2015 6:17 pm
Posts: 24
In order to get it tracking straight and true, try messing with the *dish* on the rear wheel (you guys might term it 'offset').
All it takes is a spoke wrench and some messing about.
It is a very sensitive setting....+/- 1mm will make significant changes in the tracking.


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PostPosted: Sat Apr 11, 2015 12:06 pm 
Gold Trader
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Joined: Mon Jan 15, 2007 11:40 am
Posts: 3438
I just found this thread - I remember renting one of these in la plagne in the alpes back in about 1991 :lol: I knew next to nothing about mountain bikes back then, but remember thinking they looked way cool 8)


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 Post subject: Re:
PostPosted: Fri Apr 17, 2015 7:22 pm 
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Joined: Thu Mar 29, 2007 1:08 am
Posts: 3159
Location: Kray Territory
I've been keeping an eye on this one for a good time, and with good reason as I too own a mono sided bike, or cantilever, if you want to be clever. In fact I nearly made a punt on this at the time that it was listed for sale. I should have maybe replied sooner....

As far as I can see the wheelbase looks absolutely fine and as intended, these designs need to have a degree of offset to balance and handle properly. Don't attempt to straighten it! The forks are prone to flexing but again this isn't unusual with this type of design.

The main man as far as these types of machines are concerned in the UK is Mike Burrows, he's mainly known for the Lotus 108 bike used in the '92 Olympics but has been making some interesting creations for a good few years. He's also still busy doing so as well so I'm pleased to say that they aren't a technological dead end.. for now :)

A couple of links are here, for the Lotus and also a bit of an explanation about the mono design (doesn't really help explain the alignment fully , but kinda interesting)

http://en.wikipedia.org/wiki/Lotus_108
http://www.cyclorama.net/viewArticle.php?id=278

Below are some images of my Burrows-designed 8 Freight cargo bike, complete with my finger :facepalm: . Hopefully it shows the degree of offset reasonably well (the rear wheel is concealed by the mudguard). Note that mine too has drum brakes (we also own a disc-braked variant at work but the drums are much better, and last way longer. I've heard that replacement pads will need to be machined so hopefully my brakes won't die on me anytime soon !

I hope this helps! Oh yeah, don't sell it (unless I can find a home for it) :wink:


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 Post subject: Re:
PostPosted: Sat Apr 18, 2015 3:58 pm 
Old School Grand Master
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Joined: Sun Aug 21, 2011 11:57 pm
Posts: 4198
Location: Antwerp, Belgium
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New shoes, close enough. The drum fits over them just fine and the wheel spins freely.
These are DBS part number 210613, also commonly labeled as VB313 or S613 and measuring 90mm x 20mm, just in case any other Laïti owners are searching the web for the right size.

I'm going to file down the top bit just a little though, so that the contact point is more towards the middle of the pad. I'm pretty sure they also filed out the top section when they installed the original drum shoes.

It sure is a fight getting the darn springs in place though. The new shoes' eyes are 1 or 2mm further apart than the previous ones and they didn't come with springs, so I'm going to have lots of "fun" with pliers when I install them properly.

----------

EDIT : and while I'm helping other Laïti owners, allow me to mention that this decal is one of Gil_m's reproductions. He has it on file.
I spent hours reconstructing it (from a hi-res photo of the original) in Paintshop because the original had cracks and chips (see the pics above, where you can clearly see the damage on the " i " of the inside decal).
Gil then worked his magic on the file I sent him and the end result is spot on.
I think the original was a waterslide decal. This however is a proper one, so if it gets damaged at least you can remove and replace it easily.

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Last edited by Raging_Bulls on Sun Jun 19, 2016 9:57 pm, edited 1 time in total.

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PostPosted: Wed Jul 15, 2015 11:38 am 
Dirt Disciple

Joined: Tue May 19, 2015 10:41 am
Posts: 29
@Raging_Bulls

I am also bringing back an old Laiti Navajo. I had the luck to get it in a completely original condition with very little use. I do also have these "famous" Excelioo brake hubs and their effect is also not yet acceptable. However, I did not yet work on them. Due to the fact that the bike has rarely been used I am quite confident that I can reuse the present brake shoes and that some alignment will help to increase brake power.

At the moment I am at different issue: Despite the very good overall condition of the bike, the rear central nut of the hub which locks the wheel onto the hub is totally shot. I assume this was due to the previous owner not knowing which way to loosen it. At the moment it is fixed on the bike and holds the wheel well but my attempts to loosen it were not successful so far (I did not try very hard in order to not destroy more of the nut). Can you confirm that it has a left-hand thread? It would make the attempt to loosen it a lot easier (while remanufacturing that nut would be a lot harder).

Btw.: Here are a few pictures of the bike at present from a German forum.

http://www.mtb-news.de/forum/t/zeigt-he ... 0/page-250

Thanks!

Best
Andy


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PostPosted: Wed Jul 15, 2015 9:53 pm 
Old School Grand Master
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Joined: Sun Aug 21, 2011 11:57 pm
Posts: 4198
Location: Antwerp, Belgium
Andy,

On my own Laiti It's a regular thread (clockwise to tighten, counter-clockwise to loosen). The rear one needs a lot of force to tighten it properly, otherwise you'll have drive slip in the lower gears. (the only things transferring the power from the cassette to the hub is the inside of the bearing and the cone of the nut, both of which rely on clamping force to prevent slip)

To remove the nut, don't bother with gripping or clamping the nut itself. My Laiti's wheel nuts don't even have edges, they're just round.

On the other side of the axle there should be a 15mm Allen head. Get a large 15mm Allen key, stick it in with the end pointing towards the rear.

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Have someone hold down the front of the bike and put your weight on the Allen key (to rotate it counter-clockwise).
Stand on it, jump on it if needed, the axle is strong enough. Or clamp the key in a large vice, put the bike on top and pull it in the right direction with a couple of people if you must. It should give at some point.

As soon as it loosens up a bit and the nut starts spinning, you should be able to screw it out by hand. (unless they used Loctite or if the thread is damaged). I can literally turn them with 2 fingers because mine have absolutely zero resistance once they're not clamping down the hub, and I haven't even used oil or anything on them.


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(I'm using the front one here as an example because it was loose already and I was too lazy to take the bike out of the workstand)

Hope this helps


EDIT : As for the nut itself, you can take it to a machine shop and have it rounded off. It'll look like mine then. As I showed above, there is absolutely no need to use the nuts. I've removed the wheels and put them back on a dozen times already and it always works just fine with the 15mm allen key. Just tighten by hand until it's making contact, then use the key to tighten it properly. It won't slip.

EDIT : Whoops! I made one huge mistake. It's not a 15mm key but a 14mm one. :oops:


Last edited by Raging_Bulls on Sun Jun 19, 2016 10:01 pm, edited 1 time in total.

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PostPosted: Thu Jul 16, 2015 4:51 pm 
Dirt Disciple

Joined: Tue May 19, 2015 10:41 am
Posts: 29
This does help a lot! Thanks!

I will let you know once my attempt to open that nut was successfull.

Cheers!


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PostPosted: Sat Mar 17, 2018 12:01 pm 
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Joined: Sat Mar 17, 2018 10:53 am
Posts: 8
viewtopic.php?f=2&t=381531&p=2829380#p2829380

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