"No. Came on my bike, absolutely rubbish. They might be ok for DH, but not for XC"
Now theres a sweeping statement. Which ones were they? What size? What compound? What sidewalls?
Theres at least 20 different ones!
"Arnt the 2.1s made of plastic? "
In a 70a apprantly. Theres also the 62a eXception compound in folding and UST versions. The 1.9/2.1" ones are a high roller XC tread with lower cornering lugs/more spaced out tread. 2.35/2.5/2.7" have bigger cornering tread/closer spaced tread
"great tyres but the 2.1"s are pretty small compared to a 2.35"
But the 2.35"s are still quite small. On a narrower rim is not much bigger than a 2.1" kenda nevegal/blue groove o 2.1" maxxis advantage. Even on a wider rim aren't as big as 2.25" maxxis advantage/ardent, or 2.35" Kenda Nevegal/Blue Groove or Panaracer Rampage 2.35". Though all are quite big
"If the 2.35 doesn't come up too wide i may go for that on the rear aswell, the only thing that concerns me is weight "
The 60a folding (not single ply - thats wire) comes in arounf 646-695g (according to JustRidingAlong and maxxis), and I rate my mine. Suprisingly quick on the road too (At 35/45 psi) and nice and grippy elsewhere. I say get them
"It may be the OEM ones I had"
OEM maxxis tyres? With 80a compound or something? I've not heard of that before - though possible of course?
"Also the 2.25 on the rear as opposed to the 2.35"
There is no 2.25" high roller. Maxxis do the advantage/ardent/crossmark in a 2.25" which bizarely comes up the same volume as a 2.5" in a high roller/minion/etc ..