suitable for 18 month old 30" tall?

No, their feet will not reach. My 2 year old is 36.5" tall and cannot reach the pedals. He loves to sit and use his feet to propel forward but it's painfully slow...

I'm thinking of getting this for my grandson who will be 1yr old in 7 days.. He just started walking yesterday. Is he to young or small for this?

I think it would depend upon how large he is for his age and his physical development. The manufacturer's recommendations on Amazon's site for this product say 24 months to 6 years. My grandson was 19 months old when we purchased this for him. He's on the short side and could not reach the pedals but was able to sit on it and scoot around. I don't think at one year old this toy would have been appropriate for him. They do have similar toys with handles on them that allow you to push him around and later he can scoot by himself. This is a great toy, however, and he loves it. Since he wasn't able to take it on the plane when he returned home, we ordered the same one from Amazon and had it sent to his house. I think it is a great gift.

is it to small for a 4 year old

We purchased this for our soon to be 2 yr old son. However, our 4 yr old daughter loves it too. She is more on the petite side though. I would say that 4 yrs old would be the limit for this toy.

Product Dimensions	54.61 x 20.29 x 43.1 cm; 3.38 kg
Manufacturer recommended age	24 months - 5 years
Item model number	W1778
Language:	English
Number of Puzzle Pieces	1
Assembly Required	No
Batteries Required?	No
Batteries Included?	No
Material Type(s)	Plastic
Color	Multicolor
Release date	2 November 2018
ASIN	B004UU9ZB6

Fisher-PriceHarley-Davidson Toddler Tricycle Tough Trike Toy Bike with Handlebar Grips & Storage for Preschool Kids Ages 2+ Years​ (Amazon Exclusive)

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Fisher-PriceHarley-Davidson Toddler Tricycle Tough Trike Toy Bike with Handlebar Grips & Storage for Preschool Kids Ages 2+ Years (Amazon Exclusive)