# Another Zwift Cog compatibility question **URL:** \ **Category:** Zwift Equipment\ **Created:** [October 29, 2023, 3:43pm UTC](https://forums.zwift.com/t/another-zwift-cog-compatibility-question/614736 "2023-10-29T15:43:59Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Alan\_Humphrey](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/alan_humphrey/32/501360_2.png) [@Alan\_Humphrey](https://forums.zwift.com/u/Alan_Humphrey)\ **Post date:** [October 29, 2023, 3:43pm UTC](https://forums.zwift.com/t/another-zwift-cog-compatibility-question/614736/1 "2023-10-29T15:43:59Z")
My buddy is looking at getting the Zwift Hub One. He’s concerned by this line in the Cog description: Zwift Cog works with almost any 8-12-speed bikes He’s got a Diamondback Lakeside hybrid bike from 1997. The cassette is a 7 speed with 11-28 teeth. The chain is listed as 1/2 X 3/32. My thought is that he might need a spacer to get the Cog into position, but I defer to the experts here. Can this 7 speed work with the Hub One? Many thanks! ---
**Author:** ![Stuart.Middlecoate](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/stuart.middlecoate/32/539453_2.png) [@Stuart.Middlecoate](https://forums.zwift.com/u/Stuart.Middlecoate)\ **Post date:** [October 29, 2023, 4:02pm UTC](https://forums.zwift.com/t/another-zwift-cog-compatibility-question/614736/2 "2023-10-29T16:02:10Z")
In reality all you need is for the rear mech to be aligned with the cog in a straight line so it doesn’t really matter how many gears etc…No spacer needed. The issue you have is that the distance between rear dropouts on 7 speed is narrower than the mounting points on the Zwift Hub. It will work but you’ll have to bend the frame a touch for it to fit. After that it’ll be fine. Just put it into a gear that’s aligned with the cog. ---
**Author:** ![Christian\_Cayabyab](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/christian_cayabyab/32/505259_2.png) [@Christian\_Cayabyab](https://forums.zwift.com/u/Christian_Cayabyab)\ **Post date:** [February 23, 2024, 8:19am UTC](https://forums.zwift.com/t/another-zwift-cog-compatibility-question/614736/3 "2024-02-23T08:19:58Z")
I am in a similar situation with 135mm dropouts and a 7spd mountain bike. I don’t have a Zwift Hub One, I have a Zwift Hub (original). Not sure if I will be able to get the Zwift cog to work. I’ve got a few questions. Can it even work with the original Zwift Hub? When you mention bending the frame, how do you even do that? ---
**Author:** ![Paul\_Southworth](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/paul_southworth/32/538336_2.png) [@Paul\_Southworth](https://forums.zwift.com/u/Paul_Southworth)\ **Post date:** [February 23, 2024, 12:37pm UTC](https://forums.zwift.com/t/another-zwift-cog-compatibility-question/614736/4 "2024-02-23T12:37:49Z")
You don’t need to touch the frame. A frame with 135mm axle spacing will work fine. You are not obliged to use the Cog - you also have the option of putting a 7 speed cassette on the trainer. If you do use the Cog you may need to put an 8 speed chain on the bike if it rubs on the plastic guards. (And if the chain is old, you should definitely replace it.) ---
**Author:** ![Christian\_Cayabyab](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/christian_cayabyab/32/505259_2.png) [@Christian\_Cayabyab](https://forums.zwift.com/u/Christian_Cayabyab)\ **Post date:** [February 23, 2024, 9:40pm UTC](https://forums.zwift.com/t/another-zwift-cog-compatibility-question/614736/5 "2024-02-23T21:40:16Z")
I would like to use the cog, wondering if it can work with my 7spd bike. ---
**Author:** ![Paul\_Southworth](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/paul_southworth/32/538336_2.png) [@Paul\_Southworth](https://forums.zwift.com/u/Paul_Southworth)\ **Post date:** [February 23, 2024, 9:45pm UTC](https://forums.zwift.com/t/another-zwift-cog-compatibility-question/614736/6 "2024-02-23T21:45:40Z")
Yes it should work fine. Zwift recommends it for bikes with 8 speed drivetrains (or more) but there is nothing stopping you from putting an 8 speed chain on your 7 speed bike if you have a 7 speed chain that’s too wide for the Cog. Many chains sold these days are marketed as 6/7/8 speed compatible. For example: [https://www.amazon.com/KMC-Z8-1-Chain-Speed-7-1mm/dp/B07NRF1X44/](https://www.amazon.com/KMC-Z8-1-Chain-Speed-7-1mm/dp/B07NRF1X44/) [https://www.amazon.com/SHIMANO-6-Speed-Bicycle-Chain-SM-UG51/dp/B07VMK3574/](https://www.amazon.com/SHIMANO-6-Speed-Bicycle-Chain-SM-UG51/dp/B07VMK3574/) ---
**Author:** ![Christian\_Cayabyab](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/christian_cayabyab/32/505259_2.png) [@Christian\_Cayabyab](https://forums.zwift.com/u/Christian_Cayabyab)\ **Post date:** [February 24, 2024, 6:18am UTC](https://forums.zwift.com/t/another-zwift-cog-compatibility-question/614736/7 "2024-02-24T06:18:13Z")
Great, thanks I might give it a go. I’m a total noob at any work on bikes. Would the be cutting the chain at the same length as my current 7spd, assuming my 7spd chain doesn’t work, or would it depend and I might need to make it shorter/longer? ---
**Author:** ![Paul\_Bent](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/paul_bent/32/489872_2.png) [@Paul\_Bent](https://forums.zwift.com/u/Paul_Bent)\ **Post date:** [April 27, 2024, 11:02pm UTC](https://forums.zwift.com/t/another-zwift-cog-compatibility-question/614736/8 "2024-04-27T23:02:10Z")
My 2019 Stumpjumper (148mm boost) did not work with the cog, the inside of the chainstay fouled the outer plastic bulb thingy. When I refit the wheel to the bike I can see the clearance to the cassette is pretty darned tight at that point and as the cog outer portion is so bulbous it’s never going to work. Thankfully my wife’s whyte hardtail works fine, (135mm QR) Check the clearance you have with the cassette.