I've yet to see anyone actually hit the plug with the tyre, on the 300 kit. I've run shorty R5300's through to BR9ES's and I haven't managed it yet. The main concern (it would seem) with the stock to short plug conversion is bodywork clearance. The short plugs do also offer better high rpm running, but for $30+ they bl**dy well ought to!

Please, if someone has had issues with the plug being hit by the tyre then i need to know.

You shouldn't be using NSR150 plugs anyway, but if there's a clearance problem then I want to be aware.

Thanks.