C4 front strut tube inner diameter?

[Rabbitracer43]

What is the inner diameter of the c4 front strut tubes?

[mushasho]

Building Coil-overs?

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[Rabbitracer43]

Possibly, but I have some koni adjustable strut cartridges that are 1 inch shorter body then stock as per measurements from monroe. But I know they are slightly smaller diameter then stock so I want to make sleaves in the strut tube for centering purposes. So need the ID of the strut tubes.

[Aktapod]

Mine were a little oblong when I measured, ranging from around 49.35 - 49.8mm. Koni supplied an upper centering ring for stock-sized sport struts, which has an OD of 49.6-49.7mm, and it's definitely a bit of an interference fit, at least on mine.

That being said, I mocked up a drawing for an upper centering ring for the Koni 8610/8611 Race series, if they happen to be the ones you're dealing with. I'm currently having the first set made, so no guarantee of fitment, but see attached if you're interested:

Koni Race Upper Centering Ring.png (209.88 KiB) Viewed 17296 times

Unfortunately, I won't be shortening the housings, so I'm also having a lower spacer/centering piece made as well. I think these two parts together will be all I need, since the stock setup only contacts at the top and bottom anyways.

Koni Race Lower Spacer.png (458.21 KiB) Viewed 17292 times

[Rabbitracer43]

Thanks for the help, yea I have to measure my struts, and they are not race struts. I will machine spacers at work.