Kenzie, I’m going to deviate from the above advice mildly, and I hope you take what I’m saying into consideration.
I’m going to give you several reasons for purchasing a 20" wheel rather than a 24".
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For transportation, an 18" wheel is awful - it’s hard to recommend worse. One in a hundred people rides them, and this is the very reason why. So, a 20" would be an improvement for him in these terms, and for that I think he would be grateful. For a small town, a 20" is perfectly adequate, though as a rule, the larger the wheel, the better for saving energy for transportation. But, if he was able to get around on an 18" without complaining, the 20" will be just fine.
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Perhaps the only reason you would sacrifice the extra inches, and own an 18", is because it can be good for tricks. I contend that a 20" is every bit as good and perhaps superior to an 18" even in this area.
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20" is not only as good as 18" for tricks, but compared to a 24", it is immeasurably better. If you had come in and said, “Sweetheart likes doing tricks on his unicycle, and I would like to buy him one. What size tire should I buy?” The answer would be, invariably, “20 inch”. Those I know who own a 24" and a 20", who wish to do tricks, NEVER take out the 24" for this purpose, and I don’t see why they would. You would be greatly hindering Sweetheart in his ability to do tricks by purchasing a 24". This effect will be amplified because of his stature.
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A 24" has a very different feel than an 18". Liken it to someone who rides a regular bmx bicycle being bought a mountain bike as a gift. Or imagine someone who rides a mountain bike being bought a 21 speed thin-tire street bike as a gift. Far be it from me to determine whether or not he would like the change, but it is different, and you have to decide whether it is worth the risk.
So why would anyone recommend a 24"?
Knowing nothing about unicycles, you mentioned that he needs to be able to use it to get around town. That is understandable, but I fear that others have placed too much emphasis on this statement, and are suggesting a 24". 24" is virtually the only size of unicycle that can be used for both tricks and is energy efficient. It is not nearly as fast/efficient as a 28". It is not nearly as good for tricks as a 20". However, it does have qualities of both, and for that, it has merit. Thus, I think they are recommending a 24" to cover all bases and be “safe.” However, I believe we have enough information that that is not necessary, and we can answer questions about your situation specifically.
I would be to revising my opinion if you said one of these two things:
“When he rides, he usually rides several miles.”
“If it were a bit quicker and more efficient, he would not mind if the unicycle was limiting in terms of tricks.”
So, what do you think about those statements, Kenzie?
Recommendations:
We do not know about your budget. You already said you’re putting your savings into this gift, but it is not easy to recommend specifics for this reason.
It would also be more biased, so I don’t care to add in my two cents here for fear of making the rest of the post look more biased than it is.
On unicycle.com, you can adjust/customize specific parts of the unicycle, such as cranks. You will get these parts much cheaper, perhaps 50-75% cheaper, if you do it this way, compared to if you upgraded the parts later.
I would recommend upgrading cranks, if you do not buy a Kris Holm cycle, to Kris Holm Moments cranks. These are very, very sturdy, and there is an extra piece called a Rollo that you can stick onto these, and only these, cranks. It helps a lot for certain tricks, and is pretty cheap, but I won’t go into the details here. Measure his old cranks from the center of one hole to the next. It will be 110, 114, 125, 127, or 137 mm. Kris Holm also makes cranks with two holes, indicated by a slash (110/125), and these are like having two sets of cranks at once, which, with Kris Holm cranks, would be $160. They’ll probably install one of these for you for $48 if you’d like. It’s a luxury, but an option.
Cheers
Lance