I think what you'll find is that the 10' and longer Arra spinning rods have a 50 mm first guide because people tend to use bigger reels on longer rods, with bigger spool diameters. 9'6" and under probably have a 40 mm, or even 30 mm first guide.
Also, you may be comparing spinning models to conventionals in the 11' length models.
Guide size, number of guides, and their spacing is an area in transition. Old school thinking--which prevailed when the Arras were first designed--was that bigger and fewer guides equaled less guide friction, resulting in longer casts. Modern thinking, the so called "New Concept" idea first put out by Fuji, is that a greater number of smaller guides results in longer casts by preventing coils of line from building between the guides and between the reel and first guide. Especially when using braided lines. That concept is reflected in Lami's new Super Surf rods--the 10' models come with 7 guides and the first one is a small, low framed 40 mm Alconite.
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