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skogas
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Australia
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Finally got to removing the wheels (which was a bit of a challenge since I don't yet have a central stand) - and it seems like the right arm of the Earles Fork swingarm is a bit bent outwards (left on the picture)

Is it something crash related and definitely needing straightening, or is by any any chance supposed to be that way?
Interestingly the shock on the "straight" arm had its lower mount cracked, but the one on the bent arm was ok...

Cheers

  • fork_arm_bent.jpg
  • bottom_shock.jpg
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Andy

skogas
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Hmm, found one on eBay to use

Hmm, found one on eBay to use as a reference for pictures (item 231433523233) - seems to be very similar curve as on mine, so might be normal?

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Andy

Twocams
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Seems to be normal. I asked

Seems to be normal. I asked the same question couple weeks ago about mine. Mine looks just like that on my 69 R69S.

Rich

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Twocams
69 R69S 03 K1200GT
92 R100RT

skogas
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Thanks Rich! I did a quick

Thanks Rich! I did a quick search here on the forum, but somehow missed your topic Smile
Yes, seems like exactly the same thing as you described there, which makes me feel much better now - thanks!

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Andy

BMWR50_Spain
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In my R50/2 from 1959 I see

In my R50/2 from 1959 I see the same. I haven't been able to find in the forum the question by Twocams.

Do you know why they made this in the fork?

Thanks

MikeL46
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Bent? Forks

BMWR50_Spain wrote:

In my R50/2 from 1959 I see the same. I haven't been able to find in the forum the question by Twocams.

Do you know why they made this in the fork?

Thanks

Clearance for the rear brake arm.

Mike

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67 R50/2 w/R100 engine/trans and Ural Sidecar
69 R60/2 76 R90S 78 R100RS
70 Triumph w/Spirit Eagle Sidecar

schrader7032
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Design Issue?

MikeL46 wrote:

Clearance for the rear brake arm.

Why didn't they just make the crossover piece at the back of the Earles fork wider so that there was no need for the bend? Thinking

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

MikeL46
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There are many features on

There are many features on these old bikes that make me wonder why they did it like that.

I'm sure the swingarm width was influenced by the desire to have the wheels interchange. Some detail specs must have carried over from earlier designs - maybe Ernie Earles design specs were used?

Mike

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67 R50/2 w/R100 engine/trans and Ural Sidecar
69 R60/2 76 R90S 78 R100RS
70 Triumph w/Spirit Eagle Sidecar

schrader7032
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VBMWMO #7032
San Antonio, TX
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The patent for the Earles

The patent for the Earles fork doesn't really mention details like that. In fact, the drawing that comes with the patent shows the two horizontal legs (the ones we're referring to) as being curved vertically, looking like a slight "smile" when viewed from the side. The straight ahead shot of the fork doesn't seem to indicate there's any change in the horizontal arms, ie, making it slightly smaller at the rear.

It's probably like you said...they had already designed the front end for the prototype and found a near interference with the brake lever. Rather than significantly change the rear width of the Earles fork, the production forks were probably heated and bent to accommodate the interference.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

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