Trials Australia Forums

brent j wrote: Now I have a dedicated feed to the LHS main bearing and big end. There is no cable to the pump so it stays in the idle position.
I'm running about 50:1 premix and the little Suzuki racing kit oil tank last about 3 tank fulls of fuel.

Greg Harding wrote:Love your work Brent, I always wondered what that bracket was for, it is a neat little oil tank.

Thanks for the comments and the ideas Greg. I NJB trickshox arrived (after a world tour, but that's another story) and I'm pleased with them. I have YSS PD valves in the forks with 23lb/in springs, I'm getting there. Next will be to find a pair of original RL fork legs to replace the SP250 ones fitted.

Hi Everyone,

David Lahey wrote:

Greg Harding wrote:Hi Everyone,
You are on to it David, 28 spoke holes is what I got when I first laid eyes on that hub of yours. My first thoughts were Tiron but the hubs are different and looks like many more spokes to me?
While we are going, I think this is outside Post Classic Era but has 28 spokes in a 19inch Akron rim:
Interesting as it skips spoke spaces that have never been drilled and no valve or rim lock holes, the valve comes through an unused spoke hole.

That is seriously dodgy spoke work there Greg. As well as the deliberately missing spokes, it looks like not enough rake on the spokes. Surely that's not the original rim for that hub

So David, was that Mercury what you envisaged when you first looked at your 28 hole hub?

My 28 spoke wheel looks factory to me, spins true and Spokes are tight, like the Mercurio I think it is not designed for off road? When I was about 17, (wow that is nearly 40 years ago), I radially spoked (laced) a pair of BMX wheels to see what it would be like. The lightest hubs and 20 x 1 and 3/8 lightweight rims and the lightest spokes with the shortest distance hub to rim was in a direct line. As was suggested to me, there was no give in the wheels at all but I never broke any spokes which was also suggested.
Here is an early radially spoked pair of wheels, there are some spokes missing but I think they were originally all there:

Anyway I am still keen to work out what this rear wheel is off? We thought that because there was a wheel still bolted to swing arm in the shed and there was a M99 Alpina frame under the house missing a swingarm and rear wheel that they must go together. But the rim is only 60 mm wide and it had an Ag bike directional knobby fitted, maybe that is not true?

The hub has much bigger cooling fins and is all aluminum:

Wow that's a challenge Greg.
Probably a silly idea late at night, bit I'm going to try and apply logic to working out what it is from.
So we know that the all-alloy hub type was on at least two 1966-67 models and very likely earlier but by 1968 the small spoke flange on similar hubs were being made of pressed steel and riveted on then later bolted on. This reeks of the all-aluminium small flange design being either too weak, too tricky to cast, or too expensive to make.
Another clue is that I think the square-edged cooling fins on my all-aluminium hubs predate the thin-edged cooling fins on your all-aluminium hub.
Lots of clues but needs more thought.

As for the rake of the spokes yes of course radial spokes work fine on a penny farthing because it only has a feeble human to load it with drive torque. Spoke rake is there to reduce the stress in the spokes due to the wheel being driven or braked at the hub. I can't remember which language it is but in one language the word for spoke is radio.

Your penny farthing photo reminded me of the early spoked wheels that have the (timber) spokes in compression rather than in tension. It was a design that only lasted until steel became a commodity.

I think that’s a mk4 or even maybe mk5/6 Lobito rear wheel they had the solid aluminium hub
A m99 has a bolt on spoke carrier or should do
https://www.uniquemotorcars.net/bultaco ... -model-99/

Here’s one on eBay
https://www.ebay.com.au/itm/BULTACO-LOB ... Sw1AleqRZ6

I'd have said Lobito too. Or Campera which I believe was marketed as an Ag bike in some markets.

I have a basket case. It's and RL250. It's in a very small basket. The exhaust pipe is missing the rest of the bike.

I have a few parts for sale.

Hi guys! I am chasing a magneto cover complete. Does anyone have one for me? Cheers. Thanks for helping me with the pic resizing thing Greg Harding!

Westy wrote:I have a basket case. It's and RL250. It's in a very small basket. The exhaust pipe is missing the rest of the bike.

I have a few parts for sale.

What parts do you have Westy? I'm particularly after a pair of fork legs

No reason you couldn't weld up your damaged magneto case Finally1.

I don't know if Greg knows of a capable weldor?