Thanks for your advice,

I am still using all original parts, except break blocks and the chain (they have been replaced several times and need replaced again). The tyres do need replaced, the tread has worn off the back tyre and the rubber has separated from the canvas in places and some of it has come off completely. Front tyre is better but also needs to be replaced. It was the bike shop that pointed out the rims, bearings etc. when I took the bike in to have a wheel re-trued. It was when the shop estimated it would cost £200 - £250 to fix everything and offered me £100 traded value that I started thinking about a new bike.

I like my Sirrus Comp but I figured the wider tyres of the Tricros would make it more comfortable on long rides with the drop handlebars and better quality components (due to higher price) would make it just as fast. I also figured that the Tricros would last a bit better and give me more options of places I could ride.

Am I correct in this?