what are the dimensions for this item?

I just purchased this bike for my son and daughter in-law. The captains seat tube is about 20" and the stocker is about 15.5". The seat post are plenty long to accommodate tall riders. I'm 6' 2" and my wife is 5' 1". My son in 6' 1" and his wife is 5' 8". This bike fits us all just fine. I did add a riser to the stem for my son and I. That made for a more upright position. This is a new purchase so I cant tell you what it feel like on a long ride but it feels real good right now. The seats are comfy for what we want to do with this bike. I think its going to make a fine hybrid tandem. My wife and I have logged over 10,000 miles on a tandem and I think this is a great bike for the money. I hope this helps.

What's the thickest tires i can fit on this bike? Can 27.5x2.4 tires fit on this frame?

The tires on this tandem are 26" x 2.125". If you'd like a wider tire, we recommend checking in with your local bike shop. Thanks

Any opinions on upgrading fork & most components and doing actual mtbing on this? i have the parts to upgrade everything, would frame hold up?

I think you could upgrade but I wouldn't recommend for any heavy MTB trails. Light dirt, a few rollers, and even some hills are fine. But, while I'm impressed with the frame, it's not overly rigid and I'd be concerned about it's ability to take a beating. My wife and I ride on the roads near our house and that includes some serious climbing....it's great fun. Love the bike. Think about upgrading the derailleurs if you're doing the fork.

Bike Type	Tandem Bike
Brand	Schwinn
Number of Speeds	21
Frame Material	Aluminum
Suspension Type	Front, Rear
Brake Style	Disc
Model Name	Twinn
Manufacturer	Schwinn
Brand Name	Schwinn
Suggested Users	unisex-adult

Schwinn Twinn

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