Tyre Insert questions

i just want to find out if theres difference between the following tire inserts, (they are all Tamiya insert just to make the issue clear)

53250        OP250        Shaped Tire Insert,Soft
53834        OP834        Tire Inserts Soft 26mm
and
53156        OP156        Hard Inner Sponge
53435        OP435        Medium-Narrow Hard Inner
53835        OP835        Tire Inserts Hard 26mm

obviously i know that there are the soft and hard insert difference, But would the soft tire insert gives better performance than the shaped tire insert (as an example)? or if the 26mm hard insert gives bigger expansion than the medium narrow insert?
i would like to to hear your opinion on this.

[ 本帖最後由 Administrator 於 2007-9-17 18:27 編輯 ]