Help with tyre choice please

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steve evans

New Member
Location
Lincolnshire
I have a Giant MTB with Alexrims DP17 (559x17) rims.

I will be using the bike for commuting to work on decent tarmac roads most of the time so I want to change the supplied knobblys for something skinnier with less rolling resistance for the commute and keep the kobblys for offroad riding.

I read somewhere that the tyre should be at least 1.45 times the rim size so if I understand correctly then I could go as low as 25-559.

Would this be too thin? would my delicate backside get to much hammer? should I go for 1.125 or even 1.25's?

Any advice would be much appreciated.
 
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