So weight difference around 5kg , TKM being lighter.
The main difference I think you will find apart from weight is the grip levels. CIK chassis will be made to produce more flex and reduced grip levels due to sticky tyres , where the TKM chassis is specifically designed for the Maxxis Green tyres.
The Talko S9 chassis in Junior format is also designed specifically for the Maxxis Greens , were as the S9 senior is designed for the sticky Maxxis reds so is wider and has other subtle differences which reduce overall grip.
Last year We found we ran a few tenths faster in the Junior S7 on Greens than on the senior S7 on greens in most conditions, but on hot days on grippy tracks the Senior S7 on greens was faster.
Also for more grip on cold days and tracks with low grip levels we ran a 40mm axle , on hot days and grippy tracks we ran a 50mm axle.
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