KTM 640 adv rear tube in 990 adv?

[cswood]

Hi

Please can you advise whether a KTM 640 rear tube will work in a 990 adv rear tyre?  I only want to use the tube in case of an emergency (spare).  If it will work for a few 100 km's, I will replace the tube with the correct spec when I get home.

640 tube (140/80x18) 990 tube (150/70x18).  

Thanks

Carel

 

[edgy]

 

[Malibu]

 

[cswood]

 

[edgy]