Made a Commitment ?

undertoad

undertoad

Well, you folks have been browbeating and arm twisting, to the point where I HAD to do something - I just couldn't take it anymore ! :eek:
So, this morning, I ordered 2 disc brake hubs, and 2 double wall 20" rims, from our friendly eastern neighbor.
Knowing that some of this stuff might be getting a good deal more expensive here, in the not too distant future, I thought to do it now.

And I haven't even decided to build something else, yet ...............:rolleyes:
 
Which hubs and axles do you use ?
I found bitex dh12n or dh15m for trikes.
They are narrow enough but pricey.
On the other hand front mtb hubs with thru axles are easier to source, cheaper but wide like 110mm so reduces available track
 
Trickytrike said:
Which hubs and axles do you use ?
I found bitex dh12n or dh15m for trikes.
They are narrow enough but pricey.
On the other hand front mtb hubs with thru axles are easier to source, cheaper but wide like 110mm so reduces available track
Click to expand...
Oh, spares from my own (bought) trike, an Azub Tricon 26. Bitex hubs and Rocky rims.
But now I'm using custom build wheels. Novatec hubs, but I replaced the bearings. Normaly those are 6001 2RS bearings for a 12mm hollow quick release shaft.
But to fit a 15mm axle, I needed 6802 2RS bearings and new endcaps.
The rims are RYD Andra 40's, 13G spokes.
 
20mm bolts are very heavy. You can shim a smaller bolt up at only the bearing points to save some of the weight. I've not seen a 15mm MTB axle I'd want to use single sidedly. They are usually hollow and designed for a solid mount both sides. 15mm bolts are rare if they exist at all. If anyone has used a 15mm MTB axle and it's not bent I'd love to be proved wrong. You can sleeve a m12 bolt to 15mm as the sleeves exist as cycle parts to do just that to put a 15mm hub wheel in 12mm forks.

All these options (bar hollow 15mm MTB axles) are heavier than m12 hubs and bolts.
 
So I have some 15mm hubs yet to be used for my quad , my plan revolves around 2 pieces of precision tubing and some partially threaded M12 bolts and lock nuts ?

So one piece of tubing has an i/d of 12mm , the bolt heads will be cropped off and it will be welded inside the tubing , it has a o/d of 18mm so it will run in pillow block bearings of a suitable i/d.

The other tube has a i/d of 12mm however the o/d will be 15mm this goes over the bolt for the hub to run on and the M12 lock nut holds them both onto the bolt.

Well that would be the set up should I want a 2 wheel drive from the centre of the axle.

I am currently favouring a lays-haft under the lip of the seat and a pair of chains down the outside to drive each hub individually so the m12 bolts will just go through the main frame side rails with the 15mm sleeve on the hub side.

All this remains to be built , however it should work.

I can rustle up some sketches should the description be unclear ?

Paul
 
All right, in for a penny, in for a pound, as they say.
I got to thinking, that if I might even remotely, possibly, need / want this stuff, I ought to buy it now.
And so, I got back with my buddy Ali, and also ordered a REAR cassette hub, and a nice 26" rim.
I guess I'll be building wheels .............. For something .......... :unsure:
 
15mm tube won't like fitting in 15mm bearings. Those 15mm bearings will be expecting a 15mm bolt which won't be the full 15mm but nearer 14.8mm. The adapters already exist and are not expensive. You can get 100mm and 110mm ones.

www.ebay.co.uk

Bicycle 15mm to 12mm Adapter Bike Thru Axle Hub Quick Release Size Reducer | eBay

It converts 15mm thru-axle hub to standard 12mm quick release skewer. 2ãUltralight, lighter than other material skewers, adding no burden to bike, good for reducing the weight of bike. 3ãTool-free installation, just insert the adapter into the thru axle hub.
www.ebay.co.uk
 
Popshot said:
15mm tube won't like fitting in 15mm bearings. Those 15mm bearings will be expecting a 15mm bolt which won't be the full 15mm but nearer 14.8mm.
Click to expand...
I have a man with a lathe on standby :)
Popshot said:
The adapters already exist and are not expensive. You can get 100mm and 110mm ones.

www.ebay.co.uk

Bicycle 15mm to 12mm Adapter Bike Thru Axle Hub Quick Release Size Reducer | eBay

It converts 15mm thru-axle hub to standard 12mm quick release skewer. 2ãUltralight, lighter than other material skewers, adding no burden to bike, good for reducing the weight of bike. 3ãTool-free installation, just insert the adapter into the thru axle hub.
www.ebay.co.uk
Click to expand...
Did not know they existed ?
Have you actually bought and tried any ?

Paul
 
Popshot is right, there is a variance between round bar/tube and axle bearing I.D's.
I have found that generally bearings have a far greater level of precision in their build than round bar or tube (unless they too are specialist items).
Our usual "Precision tube" supplier still has to deal with "manufacturer tolerances" and they don't usually expect tubes to end up as axles. ;)
I found that my 12mm silver steel round bar was a much better slip fit into 12mm bearings than its mild-steel equivalent. But I have still spent time burnishing round bar down to be a good slip-fit along its entire length. :)
 
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