The best single speed cog kit depends on your rear hub, chain, desired gearing, and riding style. CyclingDeal is a practical choice for Shimano- or SRAM-compatible 7–11-speed cassette hubs, while CooMeng and PeakRider emphasize a one-piece aluminum cog with a thick base. Check your freehub type before buying: these kits do not all fit the same driver, and a single-speed conversion does not necessarily create a fixed-gear bike.
| Kit | Best For | Key Detail |
|---|---|---|
| CyclingDeal 18T | Road or mountain bike conversions | Spacers, lockring, and cog |
| CyclingDeal 16T | Riders seeking a smaller listed cog option | For Shimano or SRAM 7–11-speed cassette hubs |
| CooMeng 15T/16T/18T | Dirt-jump or BMX-style use | One-piece 7075 aluminum cog |
| PeakRider Shimano HG | Shimano HG freehub conversions | Spacer set and one-piece 7075 aluminum cog |
| CooMeng 15T/16T/18T, alternate listing | Buyers comparing the listed CooMeng option | 9mm base and extra-tall teeth |
CyclingDeal 18T Conversion Kit
This kit is best for riders converting a Shimano- or SRAM-style 7–11-speed cassette hub on a road or mountain bike. It includes an 18-tooth sprocket, a lockring, and spacers in multiple sizes to help position the cog for chain alignment. The listed chain range is 1/2-inch by 3/32-inch to 1/2-inch by 11/128-inch, so some riders can retain their existing 7–11-speed chain.
Choose this kit if you need a spacer set as part of the conversion and want an 18-tooth option. Its key limitation is important: it does not turn the rear hub into a fixed-gear hub. The wheel remains a freewheel setup.
CyclingDeal 16T Conversion Kit
This version is best for riders who want a 16-tooth cog for a single-speed conversion using a compatible Shimano or SRAM 7–11-speed cassette-type hub. The kit includes a sprocket, lockring, and assorted spacers to help set the chain line. It is listed for mountain and road bikes, and its stated chain-width range covers 7–11-speed chains.
Choose the 16T option if that cog size suits your intended gearing better than the 18T version. As with the other CyclingDeal kit, it keeps the hub in freewheel mode rather than making it fixed. Confirm your hub body and chain dimensions before ordering.
CooMeng One-Piece Aluminum Cog Kit
This kit is best for buyers seeking a cog option listed for converting a multi-speed bike for dirt-jump or BMX use. The listing offers 15-, 16-, or 18-tooth choices and describes a one-piece 7075 aluminum cog weighing 66 grams. Its 9mm base is designed to distribute force across the freehub, while extra-tall teeth and a narrow-wide profile are intended to support chain retention.
Choose it if you prioritize a one-piece aluminum cog and want a choice of tooth counts. The supplied feature information does not specify a freehub standard or list included spacers and a lockring, so verify fit and kit contents before purchase.
PeakRider Shimano HG Conversion Kit
This kit is best for a standard Shimano HG freehub conversion where the buyer wants a listed spacer set included. It is designed for 7–12-speed Shimano HG bodies and includes a CNC 7075 aluminum cog plus 5mm, 7mm, and 12mm spacers. The one-piece cog has a 9mm base and extra-tall, narrow-wide teeth, features the maker identifies as supporting strength and chain retention.
Avoid this option if your hub uses a Shimano Microspline or SRAM XD driver; the listing says those standards are not compatible. Check that the hub is standard HG before selecting it.
CooMeng 15T/16T/18T Cog Kit
This is another listing for a CooMeng cog kit with 15-, 16-, or 18-tooth choices. It is best for buyers comparing the brand’s stated one-piece aluminum construction, 9mm base, and extra-tall narrow-wide teeth. The listing describes the cog as 7075 aluminum and gives a weight of 66 grams, making those specifications useful comparison points when choosing among the products here.
Its stated features do not identify a hub standard or confirm which conversion hardware is included. Check the product details for driver compatibility and spacer or lockring contents before treating it as a complete conversion kit.
Buying Guide: How To Choose A Single Speed Cog Kit
Which freehub does your bike have?
Start with the hub, not the cog. CyclingDeal lists compatibility with Shimano or SRAM 7–11-speed cassette-type hub bodies. PeakRider specifies standard Shimano HG 7–12-speed freehubs and excludes Microspline and SRAM XD. The CooMeng feature details supplied here do not name a compatible driver standard, so confirm fit with the seller’s specifications.
What tooth count should you choose?
A cog’s tooth count affects the gear ratio when paired with the front chainring. The listed choices include 15T, 16T, and 18T. Consider your existing gearing and typical terrain when comparing them; the product information does not identify one tooth count as universally best. A different cog may require a chain-length adjustment.
Why do spacers and chain line matter?
Spacers position the cog on the freehub so the chain runs as straight as possible between the front chainring and rear sprocket. CyclingDeal includes multiple spacers, and PeakRider lists three specific spacer widths. Confirm that the kit provides the parts needed to position the cog and secure it on your hub.
Will a conversion make the bike fixed gear?
No. CyclingDeal specifically states that its kit leaves the hub as a freewheel. A single-speed freewheel wheel allows coasting; a fixed-gear setup requires a compatible fixed hub and is a different conversion.
Frequently Asked Questions
Can I use my existing chain?
CyclingDeal lists compatibility with 7–11-speed chain widths and says the original chain may be usable. Check the chain’s width and condition against the kit before installation.
Are all single-speed cog kits compatible with every rear hub?
No. Hub standards differ. Check the product’s stated freehub compatibility, including whether it specifies HG, Microspline, or XD.
Does a single-speed cog kit include everything needed?
Contents vary. CyclingDeal lists a cog, lockring, and spacers; PeakRider lists a cog and spacer set. The supplied CooMeng details do not specify all included conversion hardware.
What is the benefit of a one-piece cog?
The CooMeng and PeakRider listings describe one-piece aluminum construction. Their stated features include a thick base; the listings present this design as distributing force across the freehub.