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That is a bit small, you probably will have trouble finding larger wheels in pet shops, they're probably easier to find online.
The karlie wonderland wheel is a good silent wheel that comes in a larger size & isn't too expensive.
trixie wheel also comes in a larger size but the two I had were anything but silent!
I think both are also available from Amazon as well as Zooplus & maybe other online shops.
The silent runner is by far my favourite wheel, I have the 9" for my dwarf hams that could be a good size for a smaller syrian but there is a larger one too, expensive though.