How to measure to see if our kit will work on your bike

Minimum Clearance between Inside of forks/seat stays:
3 & 3/8″ is the Minimum Total clearance between Inside of forks/seat stays. Measure 8 & 1/2″ up forks from Top of the axle, at that point (it’s where the ring sits on the wheel) you need 3 3/8″ between the Inside of the forks. 3 3/8″ is exactly the length of the long edge of a credit card. At 8 1/2″ up fork from axle, slip a credit card between the forks – if the card fits, so will the drive ring.

How-to-Measure-Lower-Forks      How-to-Measure-Upper-Fork

measure-with-card-Lower Forks      measure-with-card-Upper Forks


**Not quite enough clearance for drive ring? A customer shared steps taken when found need for additional 1/8″ between rear forks/seat stays and spokes for clearance for the drive ring: Remove rear wheel, insert long bolt thru axle holes on frame, secure w/nut – this holds forks/stays in correct position, measure along frame 8 1/2″ to where drive ring will be positioned, spread frame using scissor jack from a small car (another cust. used 2×4’s). DO NOT spread frame any more than needed. NOT recommend for the tight, ‘squeezed in’ frames. **This is ONLY recommended for those who need additional 1/8″ clearance. ** Readjust brakes as nessacery.

How do I determine what size my wheel is?
Refer to sidewall of tire to determine wheel size, numbers indicate size of wheel and width of tire.

24″ Wheel – Specific
Bicycles with 24″ Wheels –
If your bike has Caliper, Disk or Coaster brakes, And you have measured fork width for drive ring clearance – installation of the GEBE Mount Kit – With or Without Engine should go smoothly.

BUT if your bike has a V-brake, you should take one final measurement – for Ring/Brake clearance.

Measure up the fork to the edge of the brake post – if you have 8 1/2″ Clearance from the Top of the axle to the brake post, there is Adequate Clearance.

If you measure Less than 8 1/2″, from top of axle to brake post – File axle drop-outs back 3/16″. This will allow the wheel to be moved back 3/16″, providing clearance. Re-adjust brakes!!

** IMPORTANT! We DO NOT recommend you motorize a 27″ touring bike. The rims and spokes of these bikes may not hold up well to the pounding they will take at Eagle speed.

** IMPORTANT! This kit is NOT designed to mount on a Quick Release axle. The Quick Release should be replaced with a standard solid axle (available at most bicycle shops), comes with cones and bearings. – OR – You can purchase a Replacement axle from GEBE that fits the cones and bearings of the 10mm Fine or Sealed Bearing quick release axle.