BBSHD measurements

[rilot]

Thanks for that. Interesting.
At the end of the day, if I have to buy a different frame then it's no great loss. This frame is going to be a pain to mount any kind of sensible battery on anyway.
Would you guys always go with the 68-73mm BBSHD for a 68mm BB no matter what? Maybe I'm being stupid but I figured that you can make a longer BBSHD fit in a smaller BB but no matter how talented you are you can't make the BBSHD longer if it's too short for your BB.

 

[tommie]

What size is your present chainring? HD usually comes with 46T as standard.

I ask as where i`ve put the arrow you may have a problem. Mine was very similar but i got round it easy enough by just spacing the Bafang chainring out a couple of cm with a few mm of spacer and a set of longer Allen bolts.

 

[wheeliepete]

Would you guys always go with the 68-73mm BBSHD for a 68mm BB no matter what?

No, if it's too short it's no good, but you will always have issues to overcome fitting a longer drive, especially chainline. FS bikes are prob. among the most difficult to convert. Have you considered a BBS02?

 

[anotherkiwi]

FS and bad chainline = problems. Bad chainline is already a pain on a hard-tail! That is the bit you have to get right and a 100 mm BBSHD designed for a wide fatbike hub isn't going to help. Get another bike to convert and keep that one for when you need to ride unpowered.

 

[rilot]

Yeah, I think you're right. Any recommendations for a frame or complete bike I should be on the look out for? I'm not fussed about the quality of the components as I can always swap the good stuff from my current bike over (brakes, forks etc). Hardtail I guess.

 

[rilot]

After searching around and measuring stuff I found myself a more suitable frame.

It's a 2009 Felt Compulsion 2 and as you can see, has loads of clearance. The pic with the ruler is flat against the BB.

Just needs a strip down and spray to get it looking pretty again. Plenty of space in the triangle for a battery too.

Paid £80 for it.

 

[Deleted member 4366]

I'd do a trial fit of the motor before going any further.

 

[rilot]

Yeah, will do. If it doesn't fit then there's little point in tidying it up.

 

[wheeliepete]

Looks to be a more suitable frame. Check those pivot bearings too, otherwise you will have to remove the motor to change them.

 

[rilot]

If everything lines up then I'm going to strip and replace all bearings with new. Will rebuild the shock while I'm at it too.