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J. Trenga
Reviewed in the United States on May 27, 2024
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Lynn D. Lehman
Reviewed in the United States on May 16, 2024
The bearing bores are not 0.9cm/0.35 inch they are 0.8cm/0.315 inch. The 0.8cm happened to be the exact size to replace my old rollers so they worked great.
Thomas
Reviewed in the United States on May 11, 2024
I wear out my sunny obsidian surge ones and I need to replace them. These fit perfectly.
tom bozovich
Reviewed in the United States on February 21, 2024
These are a perfect fit for seat rollers on jkangfit rowing machines
Bob Koure
Reviewed in the United States on December 28, 2024
The diameter of the part of the roller that touches the rail is 2mm bigger than the OEM roller (34mm vs 32) so 1mm less clearance for the bottom roller (OEM has maybe 5-6 so not an issue)The inside diameter is listed incorrectly - it's just under 8mm, slightly tight for a M8 bolt/shaft - which is IMO perfect. The inner spacer can get a little misaligned. Just retry pushing through.The OEM spacers don't work (much too long). The space between the brackets is 100mm, this roller is 92mm so a 4mm spacer on each side is needed. I found those at servocity (don't think I can post a link here) but 8mm ID, 10mm OD, 4mm long 4ea - under $3.00While I was at the hardware store figuring sizes, I tried fitting a 5/16 bolt through this - it fit about the same as the OEM M8 bolts.I have them installed, am being very cautious as I don't have the spacers yet - and I suspect that the 'pinch grip' on both sides that the OEM wheels plus spacers had are important for structural integrity of the seat-to-roller bracket (but I'm not a ME).I can't speak to longevity as I've only used these for maybe an hour total (two workouts). If they don't last as long as a year (the OEMs went about six years [1000ish hours] before the nylon started to crack) I'll revise this review.Oh, and if you have a FDF rower, there were multiple single-rail rowers that were identical other than color (each color had a different city). I'd expect these to work on those as well (same part number on the rail). The 'Newport Plus' seems to use a very different seat/rail/roller arrangement.As far as 'ease of assembly', anything that requires I use a vernier caliper to figure fit counts as DIY. Looks to be built fine.
Peter K
Reviewed in the United States on October 30, 2024
Very tight fit on YOSUDA magentic rower, seems to be 1/8 - 1/4 inch difference between this and the OEM roller causing a bit too much friction. Still better than the wore out one, but not by much. This will be a temp fix until I can get a better rower with available parts.
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