Need help with rear shock. I’m confused.

[K78]

I have a Topfire MD17 carbon frame.

The eBay seller told me I needed a 190x 51 standard mount or 185 x 55 trunnion rear shock. I bought a 185 x 55 trunnion RockShox shock.

The frame arrived without a headset and rear axle, so I contacted Topfire. I’ve since decided not to use their headset or axle.

The sales rep told me I need a 185x50 rear shock but he seems unsure and info online is conflicting and confusing.

I don’t want to return my shock to Germany only to have to order it again.

Would greatly appreciate advice. This is all new to me.

Thanks

 

[thaeber]

Trunnion shock will not fit. The specs clearly says You need 190x51 standard mount. The mounting for trunnion requires 2 bearings in the swingarm. The swingarm of this frame is designed for standard eyelet shocks. No chance. Send it back.

 

[Plummet]

I have a Topfire MD17 carbon frame.

The eBay seller told me I needed a 190x 51 standard mount or 185 x 55 trunnion rear shock. I bought a 185 x 55 trunnion RockShox shock.

The frame arrived without a headset and rear axle, so I contacted Topfire. I’ve since decided not to use their headset or axle.

The sales rep told me I need a 185x50 rear shock but he seems unsure and info online is conflicting and confusing.

I don’t want to return my shock to Germany only to have to order it again.

Would greatly appreciate advice. This is all new to me.

Thanks
View attachment 114002
View attachment 114003

There's 2 different spec charts shown here. Maybe an old and a new model?

What actually turned up? Takes some photos of the frame so we can see.

PS... Enudro ebike frame.... hahahahaha

 

[thaeber]

There's 2 different spec charts shown here. Maybe an old and a new model?

What actually turned up? Takes some photos of the frame so we can see.

PS... Enudro ebike frame.... hahahahaha
View attachment 114914

That’s weird. But all the shox are speced 22mm mounting width, and that’s standard eyelet mounting hardware. Not trunnion.

 

[thaeber]

Could someone take the original cranks coming with M820, put them on a desk, and measure the 22,2 / 25,2 dimension?

If the Q8 is available and fits, use the 22,2 crank for smaller Q-factor. I assume the Q8 FB means Fat Bike which requires wider crank to clear chainstays. Just thinking…