RC51 forks + 954 three spoke wheel? Advice needed. - Wrist Twisters
 
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post #1 of 12 Old 12-31-2010, 06:28 AM Thread Starter
Ian
 
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RC51 forks + 954 three spoke wheel? Advice needed.

I am piecing together parts for a RC51/USD fork swap. I have a line on most the parts required to complete the conversion but want to run a 3 spoke front wheel. I know its not as nice as the RC51/900rr 5 spoke rim combo, but I can get a 954 wheel with new rubber locally for a great price.

Here's what i know about running the 954 wheel..

-RC51 axle and bearings will fit the wheel
-RC51 rotors will bolt up

Here's what I don't know..

-what spacers to run,hopefully the RC51 spacers or, custom spacers with RC diameter with 954 thickness?


Any input or advice is appreciated. I would hate to get stuck with a rim that I don't need.

Ian

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post #2 of 12 Old 12-31-2010, 07:53 AM
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Bearings, spacers, axle, seals and rotors from the RC51 swap right in and the 929/954 wheel is a dead ringer for the 9er wheel. If I remember correctly the RC51 used two versions of the caliper mounting brackets but I'm not sure what the difference was.


Dan
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post #3 of 12 Old 12-31-2010, 09:31 AM Thread Starter
Ian
 
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Quote:
Originally Posted by voodooridr View Post
Bearings, spacers, axle, seals and rotors from the RC51 swap right in and the 929/954 wheel is a dead ringer for the 9er wheel. If I remember correctly the RC51 used two versions of the caliper mounting brackets but I'm not sure what the difference was.

Exactly what I needed to hear. Should be picking up the wheel this week then.

Cheers,
Ian

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post #4 of 12 Old 01-04-2011, 09:15 PM
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Post up some pics, and lets race to see who can complete their Canadian 919 RC51 conversion first I just need a 929/954 lower triple...

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post #5 of 12 Old 01-04-2011, 09:43 PM Thread Starter
Ian
 
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I think you will have me beat.

All though i do have my 929 lower tripple and 919 stem en route, so I should be starting the machine work in a week or so.

I just have to many projects on the go right now, the 9'ers taking a back seat to the rally-x car for a little bit.

Good to see another canuck on the board though, good luck with conversion.

Cheers,
Ian

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post #6 of 12 Old 01-05-2011, 10:12 AM
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How are you going about fitting the 919 stem into the 929 lower? From what I have gathered you have to add material to the base and then machine it off to get press fit clearance on the 929 lower. Thanks to a member on this site I have drawings to have a custom stem made, which I thought would only be a bit more $'s than the other option.

My machinist friend is saying 4140 steel in our initial converstation, can anyone tell me what the stock steel is??

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post #7 of 12 Old 01-05-2011, 11:02 AM Thread Starter
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I was going to have the OEM stem built up and turned down. Seemed like the easiest way to me. I am unsure of the material, but also would like to know?

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post #8 of 12 Old 01-05-2011, 11:59 AM
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The stock 919 lower is cast steel and surely of a low grade, I doubt very much it will be alloyed at all, and most likely a simple carbon steel.
The 919 stem is likely a non alloyed carbon steel, something like a SAE 1020.
4140 is a chrome moly steel and overkill for the stem BUT there is so much 4140 kicking around that it is likely easy to get it cheap, or even to be able to scrounge a suitable piece for free should you have some shop connections to tap.
1340 is a manganese steel that would be a good choice, again, overkill, and not nearly as easily scrounged as 4140.
Curve ball though.
The stock 919 stem, and surely the 929/954/RC51 is hollow.
If you make a stem from bar, it will weigh lots and anyone doing a RC51 conversion will want a stem no heavier than stock.
Long drilling or long boring a length of bar will not be pleasant, especially in an alloyed steel.
You might be able to find a suitable tubular steel that has enough wall thickness to accommodate the various ODs required along the length.
No wonder people want to salvage a stock 919 stem and re-use in a 929 lower.

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post #9 of 12 Old 01-05-2011, 12:44 PM
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here is the stock 919 stem with 929 lower and custom top triple

Attachment 13986

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post #10 of 12 Old 01-05-2011, 01:14 PM
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Quote:
Originally Posted by zaq123 View Post
here is the stock 919 stem with 929 lower and custom top triple

Attachment 13986
I would describe that as THE setup !

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post #11 of 12 Old 01-06-2011, 06:41 AM
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mcromo44, you really are a wealth of info! Thanks


I am going for the exact set-up above but with a LSL Upper. I will post pics when Im done

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post #12 of 12 Old 01-06-2011, 06:46 PM
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[QUOTE=Blue919Guy;426892]mcromo44, you really are a wealth of info! Thanks


QUOTE]

+1

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