Sprockets and chain length

Hi guys.

Am going to go -1 on the front and +2 on the rear on my 2010 blade sprockets and was just wondering if I have to alter the number of links on the chain to compensate?

 

you should be ok with that, but here is a calc for you to check it


http://www.rebelgears.com/chainlengthcalculator.html

 

Thanks! Handy tool that.
I assume I'd need a speedo healer too?

 

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-1f +2r wont be that far off if you have a 55 tyre? I run -1f +4r and use a speedo healer, but again you can work it out on this app

http://www.healtech-electronics.com/ht_sh_online_calculator_en.html