[Closed] Is this bike too small - advice needed

Theoretically your saddle should be the same distance from the pedal at the bottom of it's stroke, so it'd need to be higher again. In real life a lot of people run them a bit lower on a mountain bike. I'd definitely try a longer post if it's out that far, but I suspect you may be right and need a bigger bike.

road bike setup would be the MAX for your mtb. Most opt to run the saddle
somewhat lower for better "clearance" 🙂 My mtb was 46cm with a large
amount of post, where as the roadie is a 54cm with very little post - both
fit ok - just remember the min insertion line !!!

What height are you, and what size is the bike? Better to look for a sticker on the frame, the normal method of measuring from BB centre to TT may not apply due to sloping top tube, many manufacturers measure to the seat clamp.

Personally, by the fact you're using a 120mm stem suggests its too small to me as you're trying to increase the reach by adding a long stem meaning the effective top length is too short for you on the P7. Base sizing on effective top tube length and not seattube length.

frame size wise it looks very similar to my road bike v my inbred. I have about 370mm post showing but i have less of a reach to the bars on my mtb so id run a shorter stem than my road bike so im sat up more if you get what i mean. My mtb is a 16 as the 18 of the same bike was too big. And my road bike is 54cm for comparison

Seat tube length isn't that important really (within reason obviously) as long as you can get a seat post long enough (thomson 410mm would be ideal).
Its the top tube length thats more critical, if it feels too cramped with an 80mm stem (which i'd consider quite long anyway) then i'd say the frames too small for you, but remember the ride position on an mtb will be more upright than your road bike, are you sure your not trying to get too stretched out on it? how tall are you and what size is the bike?

If it is too short then fitting a longer stem/moving the saddle right back on a layback post may get you the length but its a bodge and will ruin the handling.
120mm stem...?! didn't think you could even buy them that long anymore, don't think i've ridden a bike with a stem that long since the mid nineties 😆

It also of course depends on what you want the bike for, if its just a mess around in the woods type playing around bike then it may be big enough, but if your planning on riding any mileage on it then probably not.

The minimum insertion mark on the post is only for the safety of the post [& you]
Make sure that any post is also well past the top tube/seat tube joint as well or your frame may well not make it

oh - It looks too small to me

Thanks for all the replies!! My last MTB was a Marin Pine Mountain back in 1997, I thought that they'd changed a bit since then. This was partly why I was wondering about sizing, I thought that maybe I just needed to get used to the look of modern XC bikes.

I use a 140mm stem (all those Belgian pros can't be wrong...) on my road bike, so 120mm didn't seem that long, but it sounds like it is - now I see why chainreaction lots of 120mms on sale. But is a longer stem not a valid way of increasing reach? I know that pushing the saddle further back isn't (since it changes your position relative to the pedals) but does a using longer stem affect anything else?

When I measure mtb reach vs road bike reach, should I compare the reach to the bars on both or the reach to the bars (mtb) to reach to the STI hoods?

personally i measure my tip of saddle to centre of stem and it works for me.dunno if there is meant to be a correct method or not. All my saddles are the same so measuring from saddle tip is accurate. Seat height wise i run the same length from pedal to seat on mtb and road sometimes i feel mtb would be better lower but if i lower it i struggle on climbs