scootz
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| posted on 15/11/11 at 08:34 PM |
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Using Single-Sided Swingarm Bike Stub-Axle on Front Car Upright...
I've seen some bike wheels that I think would go well on the front-end of my trike.
Like most from a single-sided bike swingarm, they are centre-lock peg-drive, so would require an engineered solution rather than an off-the-shelf
one!
Would making use of the stub-axles from the bike in question be a good starter-for-ten, or better to just scratch-engineer a pair instead?
It's Evolution Baby!
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wylliezx9r
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| posted on 15/11/11 at 09:15 PM |
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Don't like doing things the easy way do you 
I spent a lot of money on booze, birds and fast cars. The rest I just squandered.
George Best
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scootz
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| posted on 15/11/11 at 09:17 PM |
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Where's the fun in that!? 
It's Evolution Baby!
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nick205
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| posted on 15/11/11 at 09:21 PM |
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Looking at that, you could almost see it being grafted into a Sierra front upright with the hub and bearings removed. If you can work with rear
steering (i.e. rack behind the front axle line) then the same would apply to most FWD uprights as well.
Failing that, I'd imagine it would be cheaper to start with the stub axle shown and engineer a fabricated upright around it. To have something
machined like that would be £££ for 2-3 pieces. Also if the upright is fabricated around it you'll get design freedom in terms of geometry; KPI
etc.
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MikeRJ
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| posted on 15/11/11 at 09:29 PM |
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Never liked the idea of bike wheels used like this, I'd suspect they aren't designed to take any significant lateral forces because they
don't need to on a bike.
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scootz
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| posted on 15/11/11 at 09:55 PM |
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quote:
Originally posted by MikeRJ
Never liked the idea of bike wheels used like this, I'd suspect they aren't designed to take any significant lateral forces because they
don't need to on a bike.
I thought that way too when I started out on this venture Mike, but the more I think of it, the less it concerns me. My trike will weigh 275-ish kg,
so the wheels won't get pounded as much as they might on a traditional-Seven-type kit. Furthermore, I'm thinking that I'll be
running 180-section bike tyres up front to reduce some of the reverse-trike oversteer and that should also lessen the lateral loads.
I'll put it in my will that LCB should be notified if my demise comes about due to front-end wheel failure!
It's Evolution Baby!
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TAZZMAXX
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| posted on 15/11/11 at 10:15 PM |
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For my money, that stub looks stronger than a lot of car axles so I don't think it would be a major issue.
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scootz
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| posted on 15/11/11 at 10:25 PM |
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Just on another note... I see that the bike wheels are stamped with the JWL and Dot-E marks (both of which relate to cars). There is no further
distinguishing between car / bike wheels, so I guess (note the italics ) that this means the bike wheels meet the minimal 'car'
standards???
It's Evolution Baby!
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Volvorsport
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| posted on 15/11/11 at 10:55 PM |
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ive been looking into some lightweight uprights , that come from a road legal buggy , that weighs approx the same as yours that seem quite good value
.
even better is that all the balljoints, steering etc are available .
the brakes etc are all bolt on , i think the main problem is wheel selection.........
www.dbsmotorsport.co.uk
getting dirty under a bus
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daviep
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| posted on 15/11/11 at 11:06 PM |
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Is the shaft hollow? You'd need some meat to machine but it looks like it would be pretty simple to machine the shaft to fit a FWD hub.
What kind of hub are you hoping to use?
Davie
“A truly great library contains something in it to offend everyone.”
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Peteff
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| posted on 16/11/11 at 09:43 AM |
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Are the bike wheels from a chain drive with sprocket and cush drive ? The one you have there would work with an upright designed for it and you could
fit car tyres to the rim which would work better than bike tyres. You would have a spindle which stays still more like a rear stub axle on a front
wheel drive car as opposed to one which rotates like a Sierra or front wheel drive.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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scootz
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| posted on 16/11/11 at 09:53 AM |
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The stub-axle pictured is the actual one for the bike wheel that I might be using. Remember that it's peg-drive, so the stub-axle itself would
have to rotate in the upright.
[Edited on 16/11/11 by scootz]
It's Evolution Baby!
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daviep
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| posted on 16/11/11 at 10:05 AM |
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Is the shaft hollow? If so how much metal is there to work with for turning to fit a hub?
Davie
“A truly great library contains something in it to offend everyone.”
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scootz
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| posted on 16/11/11 at 10:07 AM |
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I don't have one to hand just now Davie. I'll do my usual and buy one... expect to see it in the For Sale section soon after we discover
it's a non-starter!
It's Evolution Baby!
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daviep
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| posted on 16/11/11 at 10:15 AM |
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Is the picture of a triumph spindle? It looks almost identical to the spindle on my Sprint ST (which is hollow).
Davie
“A truly great library contains something in it to offend everyone.”
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scootz
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| posted on 16/11/11 at 10:18 AM |
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I love this website (and especially you Davie!).
Yes, it's an ST 1050 spindle!
It's Evolution Baby!
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daviep
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| posted on 16/11/11 at 10:27 AM |
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If you need any measurements let me know.
“A truly great library contains something in it to offend everyone.”
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scootz
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| posted on 16/11/11 at 10:31 AM |
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That's not what I wanted to hear Davie... I wanted you to say, "yes Scootz it will work beautifully and I would consider it an honour to
make you two such uprights for your fabulous three-wheeled chariot"!
Seriously though... do you think the idea has potential, or am I looking at a load of expensive complications?
Cheers!!! 
It's Evolution Baby!
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daviep
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| posted on 16/11/11 at 10:51 AM |
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My bikes not here but I'll have look at it tosee how easy it would be to machine it to fit, if it's not too thin I think it will be a
dooddle to make a front hub to suit. My only concern would be that it might be quite bulky as the minimum bearing size will be dictated by the size of
the shaft, which is relatively large.
What type of brake disc/caliper are thinking of using?
You got any pictures of what you would like the front hub to look like?
Davie
edited to remove absolute nonsense the wife typed
[Edited on 16/11/11 by daviep]
“A truly great library contains something in it to offend everyone.”
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Theshed
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| posted on 16/11/11 at 11:22 AM |
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Its probably easier to make a stub axle to fit an existing upright (or hub for a fixed stub axle) a fairly simple turning job. The difficulty might be
with offset. For that reason a custom upright might be the only way to go.
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daviep
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| posted on 16/11/11 at 01:55 PM |
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OK scootz
After a bit of googling I think it may work beautifully and I may considermaking you two such uprights for your fabulous three-wheeled chariot"!
What suspension is going on the front?
Davie
“A truly great library contains something in it to offend everyone.”
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scootz
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| posted on 16/11/11 at 02:04 PM |
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Bugger... I wanted to see what Mrs P wrote! 
I've picked up a set of Brembo M4 Monoblocks and would like to try and use them. They normally run on bikes with 320mm discs, but I'd
want to try and reduce that diameter as much as possible. I also like the 17" wheel from the back of the ST 1050 bike, so may go down that
route (added bonus that it fits right onto the Triumph hub!).
So...
+
+
+
+
=
It's Evolution Baby!
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scootz
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| posted on 16/11/11 at 02:05 PM |
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quote:
Originally posted by daviep
What suspension is going on the front?
Double wishbone with a design of your choosing!
It's Evolution Baby!
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daviep
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| posted on 16/11/11 at 02:22 PM |
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quote:
Originally posted by scootz
quote:
Originally posted by daviep
What suspension is going on the front?
Double wishbone with a design of your choosing!
Give me strength....I thought it was vw based at the front?
Do you have any plans for what is happening at the front such as height of the hub and the placement of the steering arm in relation to the top and
bottom joints - are these to be rose jointed or ball jointed?
“A truly great library contains something in it to offend everyone.”
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scootz
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| posted on 16/11/11 at 02:39 PM |
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The tub was designed to take the VW beam, but everything I've read about the handling characteristics of a front-end trailing-arm set-up screams
'DITCH-FINDER'!
The forward wishbone clevis mounting points are straightforward enough as these bolt straight onto the hard-surface of the footwell bulkhead.
I've spoken with the guy who made the tub and he's suggested bonding a box-section frame into the inside of the cockpit to take the loads
of the rear wishbone clevis mounting points. He just needs me to decide where the mounting points should be and then drop the tub and a suitable
box-section frame off with him to do the CF work.
Thing is... I haven't the slightest idea about what constitutes good front suspension geometry, so will need someone to give me a guide!
The front end is essentially a blank canvas!
You're more than welcome to come over to Haddington and have a look to see what you think. I'll cover your fuel and supply lunch / tea!
It's Evolution Baby!
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