Difference?

Older 125s and 270s often have the motor on the RH side of the chassis with a fuel tank on the left, though the modern ones have moved to a LH motor like the 600s. All modern (post 2000) 600's have a downtube cage in the front, whereas 125/270s are often just old-style cockpit only cages. Tubing diameters can vary, and often the smaller cars are narrower compared to a 600. I don't think any of this is by rule, just that as the 600's evolved they got bigger.
 
Older 125s and 270s often have the motor on the RH side of the chassis with a fuel tank on the left, though the modern ones have moved to a LH motor like the 600s. All modern (post 2000) 600's have a downtube cage in the front, whereas 125/270s are often just old-style cockpit only cages. Tubing diameters can vary, and often the smaller cars are narrower compared to a 600. I don't think any of this is by rule, just that as the 600's evolved they got bigger.
Thanks
 
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