Will the battery fit into this type of frame?

Joined
Jul 28, 2012
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63
Hello,

Im considering building an e-bike with a frame like the one seen in picture below. I want to use a frame mounted battery - a dolphin pack or frame bottle pack. My concern is if the back will fit in this type of frame as it is mounted in between the two bars, on the place for waterbottle holder.

What do you think?

Maybe its possible to place the battery on the upper bar? but there is no holes for water bottle holder there.

ortler-harstad-standardcykel.jpg
 
Very unlikely it will fit between the two bars, on the top tube sure, and yes you will need to design a way to mount it.

I would say you're better off using a different frame style as you're going to loose the "step through" of this one with the battery mounting.

There are other step-through frames that will allow for a battery however:

bulls-cross-lite-e-electric-bike-review-lbox-600x300-FFFFFF.jpg


Or you could use a frame that is just a more compact triangle while still having a pretty low top tube:

48988-1204161219351886969346.jpg


Make some measurements, you might fit a battery there, but also remember these batteries generally need a few inches longer to allow them to mount and dismount from the bracket.
 
I kinda doubt it’s gonna fit. Depends on measurements but I doubt if most battery packs would fit that frame?

Water bottle mounts can always be added using Rivnut brand threaded inserts swaged into the tubing. I fabricated my own swaging tool so the cost is/was low and they’re very handy thing to have on hand.

Bike shop probably has Rivnuts too and might do the job?
 
Big thanks guys.
Im gonna make a cardboard model of a battery and bring to the bike shop and try the fitting on differend models.
My wife has so short legs, she needs a step throug model :wink:
 
If your bike doesn't have the water bottle fixings, it's easy to add your own. They're called rivnuts and cost next to nothing. You don't need any special tools to fit them - just a drill. You need size M5.

http://www.ebay.co.uk/itm/50-Rivet-nuts-Rivnuts-Nutserts-M5-Steel-Flathead-Long-/380255508432?hash=item5888fe97d0:m:mQ9KgOQ2GX_Cs9BfxhzQAMQ
 
Top bar. Add the mounts, or McGuyver a clamp to hold the base plate to the bar.
 
dogman dan said:
Top bar. Add the mounts, or McGuyver a clamp to hold the base plate to the bar.

Would clamps be strong enough? Battery packs are rather heavy, there will be alot of force sometimes on bumpy roads.

Interesting with rivnuts, i have to look into that. Then maybe I can use an even deeper step through frame.

Do you think it would be possible with rivnuts on this one? Maybe the upper bar is solid?

Vermont_Vermeer_Damen_grau%5B870x500%5D.jpg
 
d8veh said:
If your bike doesn't have the water bottle fixings, it's easy to add your own. They're called rivnuts and cost next to nothing. You don't need any special tools to fit them - just a drill.

In my observation, it's almost impossible to set rivnuts using just the applicable fastener. You need the matching setter and mandrel, just as with normal rivets.
 
Manneokoko, with the kind of bikes you are showing in your photos, what's wrong with putting the battery on the rear rack?

A downhill bike don't want one, but for a bike ridden on streets and suburban bike paths, especially a step-thru, my opinion is that 6 to 8 pounds of battery on a rack is no big deal to the bike's handling. My 48V 11AH dolphin with 30Q cells weighs 6.2 pounds. I lay it on padding inside a bag, on a good rack, and it's fine.

I'll go weigh my rack battery later. Edit. That's a 48V 13.5AH unit with NCRB cells. It's 8 pounds,
 
Chalo said:
d8veh said:
If your bike doesn't have the water bottle fixings, it's easy to add your own. They're called rivnuts and cost next to nothing. You don't need any special tools to fit them - just a drill.

In my observation, it's almost impossible to set rivnuts using just the applicable fastener. You need the matching setter and mandrel, just as with normal rivets.

I've put rivnuts in more than 10 bikes. I always add an extra one even if the bike has them already because three is stronger than 2.

I don't have those tools. I just use a strip of steel with a 6mm hole in it, which you can make out of any scrap. The strip is necessary to hold the rivnut down while you tighten the bolt/screwotherwise the rivnut can end up not flush with the frame.

Method: Drill the hole in the frame; insert the riv nut into the frame; place the steel strip over the rivnut; put a washer on 5mm bolt or cap screw, then screw it in until the riv-nut is riveted. If the rivnut spins, then undo the screw a bit to leave a small gap, then insert a screwdriver either side under the washer and lever upwards. repeat until the rivnut is tight enough to stop spinning, In most cases, I don't need to lever anything.

manneokoko said:
Do you think it would be possible with rivnuts on this one? Maybe the upper bar is solid?

Vermont_Vermeer_Damen_grau%5B870x500%5D.jpg

You can put rivnuts into any frame mase of just about anything except carbon fibre. I doubt very much that that frame is solid steel. it would be too heavy.
 
When I said clamp it,, I meant fabricate a stout clamp from strip steel or aluminum. I did not mean a hose clamp. I meant something where a 1/4 inch bolt is used to crank down on the clamp.

I also agree, if your rack is not flimsy and wobbly, under 10 pounds on a rear rack does not screw up handling enough to care about, for commuting or other city riding. I'm never going back to a 15 pound battery on the rack though. Not unless it's low in panniers.
 
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