I use Velosolo cog on a 26" mtb rear wheel with the casette side converted to singlespeed for a diy flipflop (very easy to match chainline to the disc side). with v-brakes. The chainline is a bit skechy for now because of mismatched cranks/bb width (too wide in front even with two 1mm spacers under the cog and chainring in middle position). I intend to fix the bb width, but so far I've had zero problems, running 1/8" chain on 1/8" VS cog and 3/32" middle ring from an mtb triple, 32/17 for winter gearing.
What's the advantage of Tomicog over Velosolo? The seem a bit more expensive, even with international shipping for VS included. For extra 2 pounds VS is also available in 15t and 22t. The quality of VS seems very high and if you wear one out you get free replacement:
We are confident these are the hardest wearing disc mount cogs available and guarantee the original purchase for life to the original owner. If you wear one out send it back and we will replace it with one of the same size free of charge. We only ask that you have run it in both directions and keep your proof of purchase.
Not saying Tomicogs are not of high quality, just not familiar with them. My experience with VS is very good, but I'm not an expert, this is my first fg conversion
