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172bhp is what Renault quote for power at the flywheel:
You loose some of that power through the gearbox - heat, noise etc
Which means you have less power at the wheels - its unavoidable
I wouldn't personally:
I use these in winter - http://www.camskill.co.uk/m95b0s623p106569/Hankook_Tyres_Winter_Snow_Car_Hankook_W310_Winter_I%2Acept_Evo_Hankook_W_310_-_195_50_R15_82H_TL_Fuel_Eff_%3A_E_Wet_Grip%3A_C_NoiseClass%3A_2_Noise%3A_72dB
And they won't cost much more than the 're-treads'