Author Topic: Pit bike SDG wheel bearing spacers  (Read 58 times)

Jimr1999

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Pit bike SDG wheel bearing spacers
« on: 04 Mar 22, 01:55 pm »
Having just got two outwardly identical front 17" pit bike wheels and stripped the bearings out, I find that they have differing bearing spaces.
Spacer tube 1 is 53.3mm long and the wheel had no dust seals
Spacer tube 2 is 42.2mm and had dust seals.

I have the Gemini 70mm stub axles (measure just over 69mm) which would indicate that the 53.3mm one plus 2 10mm bearings would be about 4mm of tightening down.

two questions.
Q1. Is 4mm of tightening down too much (or too little)?
Q.2 The seats on the hub are deeper on the one with dust seals. I intend to get as much space between the bearings as I can for better lateral load handling, do I need to shim out the depth of the seats to stop the bearings moving or is this not an issue.
Thanks for your responses in advance,
JimR
... You can lead a horse to water, but a pencil must be lead.

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RhysN

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Re: Pit bike SDG wheel bearing spacers
« Reply #1 on: 04 Mar 22, 03:42 pm »
The spacer tube should only just (fancy engineering term) be squeezed, nothing more. I'm unsurprised that you have found this.
We must avoid torturing our brains with false problems, it occupies but it can annoy. In jest!