I bought a MTB for urban circuit and changed the tires to 700 x 35. Is there a big difference between the frame geometry of a BTM in comparison to of a hybrid one? The frame size is 19'', and my leg length is 32''. The calculator of frame size gave the ideal dimension of 18''.

So the MTB with hybrid tires has a frame longer than the one for my height and leg length and I bought it to use it in the city.

Shall I change my bike, or is it ok?

It should be ok for urban riding.

Its not too different in setup from a hybrid frame.

The problem is not only in the frame geometry, but also in the frame size. It seems that the right size for a MTB for my heigth should be 18'' and the one that I bought is 19''. On the other hand, the right frame size for a hybrid bike should be 20-21'' for my height. So the MTB that I bought, despite having already hybrid tyres, doesn't have the frame dimensions neither of a MTB nor a hybrid bike and I think is small for me because I had to rise the saddle more than the normal for my leg extension be ok.

So I really don't know if I should swap the MTB for a hybrid one, considering also that the lattest that is for sale for the same price is v-break whereas the MTB that I bought has hydraulic discs.

Thank you for your help!

You have said in the first place you bought the wrong size bike! In that case, swap it for the correct size bike.

No, I said it is a big frame for MTB use and too small for urban use. And as I am using it for urban riding, I don't know if is too small or too big, since the frame is not of a road nor a hybrid bike!

Oh, you have 2 threads.

As I said in the other one. Most companies don't make an 18 and a 19. Your next size down for the same make and model is probably a 17 or 16.5".

18" calculator result is just a rule of thumb. A starting point.

Move stem up or down in the spacer stack, flip the stem, slide saddle fore and aft, etc, to dial in your fit.

If a calculator told me 18 and I had the choice of 17 or 19, I'd probably pick 19, because I like to stretch out a bit.

Also, I'd probably get a zero setback seatpost to make the position more roadbike like.

Post a pic of you on the bike, and opinions can be shared on fit.

IF the 19" MTB has a more sloping top tube then there is a chance that it has similar reach to a 20-21" hybrid.

Stack and Reach are more important than frame size/seattube length.

The MTB has also a gear ratio of 12/32 in the rear and 24/32/42 at the front and the saddle is probably tougher than the one of the hybrid bike. For a 20 Kms distance in streets travel, I don't know if the MTB gets too unconfortable.

The models of boths bikes are: Berg Crosstown F5 21' and Berg Cycles Crosstown F5 21'.

Thank you.