Trials Australia Forums

Bully fanatic wrote:So David, can I enter my Sherpa in this clutch pull competition? There is a big difference between those two levers. I know which one I`d prefer. That`s why I still stick with the Amals on all of my :Bultaco: s. Much better leverage.

AMAL levers are certainly a wonderful example of industrial art. I went and took these photos tonight and as I looked around deciding which AMAL to take a photo of, realised that all my Spanish bikes have AMAL levers, which is just how I like it. I reckon Spanish bikes look strange with something else and other bikes look strange with AMAL levers.
As well as looking strange on a KT, the AMALs hole spacing at 23mm is certainly better than Japanese levers at 25mm, but still doesn't match the 20mm of the Ballard's levers.
The bottom photo shows a Ballard's lever and a recently-manufactured genuine AMAL lever, soon to go on a Bultaco M85 Alpina
The upper photo is a 1970s AMAL lever on a M138 Alpina
As for the clutch pull competition Bullylover, yes I think it would be highly interesting for you to take part in the clutch pull competition

Just making it known that you can still buy new genuine spoke kits for TY175 and TY250 front and rear from Yamaha dealers. Here are some I picked up during the week from Gladstone Motorcycles. They weren't in stock in Australia so they took a while to get here from Japan but they are exactly what I wanted.

I have been working on some trials bike wheels lately and decided to see how much variation there was in the weights of a few rear trials bike wheel rims.
Greg Harding has extolled the virtues of the TY250A rear rims previously in that it is quite a wide section which suits the fitment of modern tubeless rear tyres without any special treatment.
Here are the weights I got today.
All of these are 18" trials bike rims.
TY250A 2100g DID
TY250D 1670g Takasago (Japanese copy of shoulderless AKRONT)
KT250 1900g DID
M80 Sherpa T 1650g AKRONT mud catcher

Hi Everyone,

David Lahey wrote:Greg Harding has extolled the virtues of the TY250A rear rims previously in that it is quite a wide section which suits the fitment of modern tubeless rear tyres without any special treatment.
Here are the weights I got today.
All of these are 18" trials bike rims.
TY250A 2100g DID
TY250D 1670g Takasago (Japanese copy of shoulderless AKRONT)
KT250 1900g DID
:Bultaco: M80 Sherpa T 1650g AKRONT mud catcher

David, TY 250A is a 2.15 wide rim and all of the other TY 250 Twinshock rims are 1.85 wide and I think they are the same as all of the TY 175 rims.
The only other one that I have without the heavy bit in the middle is:
RL 250 2.15 wide rim at 2200g:

Has anyone else got any for a comparison?

While we are going, maybe we should weigh the heavy bits in the middle and something tells me that the M80 is going to be somewhat of an anachronism?

Greg Harding wrote:Hi Everyone,

David Lahey wrote:Greg Harding has extolled the virtues of the TY250A rear rims previously in that it is quite a wide section which suits the fitment of modern tubeless rear tyres without any special treatment.
Here are the weights I got today.
All of these are 18" trials bike rims.
TY250A 2100g DID
TY250D 1670g Takasago (Japanese copy of shoulderless AKRONT)
KT250 1900g DID
:Bultaco: M80 Sherpa T 1650g AKRONT mud catcher

David, TY 250A is a 2.15 wide rim and all of the other TY 250 Twinshock rims are 1.85 wide and I think they are the same as all of the TY 175 rims.
The only other one that I have without the heavy bit in the middle is:
RL 250 2.15 wide rim at 2200g:

1554712921164.jpg

Has anyone else got any for a comparison?

Yes you are spot on Greg about the heavy bit in the middle of the TY250A rim. Lucky it's there though or there would be nothing to attach the spokes to. I also weighed a 2.15 wide "yellow sticker" AKRONT shoulderless rear rim (which is something you might find on a 1975 Alpina or Pursang) and it was pretty much the same weight as the TY250A 2.15 rim (no surprises there)

One thing I'm fairly confident of is that there would be at least 1 kg difference in weight between a post-1973 Sherpa T complete rear wheel and a KT250 complete rear wheel. A fun comparison for a later date when I can reach my M198 back wheel

Greg Harding wrote:Hi Everyone,
While we are going, maybe we should weigh the heavy bits in the middle and something tells me that the :Bultaco: M80 is going to be somewhat of an anachronism?

Yes, I suspect that the M80 rear wheel hub well and truly compensates for all the lightness built into the rim

Well I finally despoked a KT250 rear wheel today so weighed the KT hub and a TY rear wheel hub.
I weighed them assembled with axle, brake plate and shoes and also weighed them just with bearings and bearing spacer.
Whole enchilada:
KT250 4160g
TY250 3380g

Just the hub bearings and spacer:
KT250 2610g
TY250 2130g

Hi Everyone,

David Lahey wrote:One thing I'm fairly confident of is that there would be at least 1 kg difference in weight between a post-1973 :Bultaco: Sherpa T complete rear wheel and a KT250 complete rear wheel. A fun comparison for a later date when I can reach my M198 back wheel

David, here is a M49 rear wheel assembly, I think the same as M80 :

And here is a M198 rear wheel assembly at about 2/3rd the weight:

Today is the Inaugural National Banana Day so Peel Good, Feel Good!

Is it just me or do the offset hub/unbalanced wheels look like they are Banana shape?

Or have I just looked at TOO many Bananas

Hi Everyone,

David Lahey wrote:Well I finally despoked a KT250 rear wheel today so weighed the KT hub and a TY rear wheel hub.
I weighed them assembled with axle, brake plate and shoes and also weighed them just with bearings and bearing spacer.
Whole enchilada:
KT250 4160g
TY250 3380g

TL 125 3500g

Anyone else got anything exotic like maybe

Here's a few pics of my latest restoration. This one isn't as fancy as my previous but it has had a total resto from top to bottom, new tyres, stainless spokes, new brakes, nice paint job, refurbished exhaust.
After I sold my last effort this one is definitely a keeper,( but everything has its price !!) with a new exhaust system on the way.
Before and after pics attached.
Yes the bash plate is finally fitted
Galps