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The Akiema 100sx front hub is not vey large and shouldn't need a any brake alteration nor the Bafang G370 with 92mm spoke hole flange though due to the axle design would need steel forks as you can't utilise ant torque arms at all and can only fit one AR washer on the rhs. If you are light...

Nearly all rear geared hubs use 12 x 10 axle, your one is certainly not deep enough.

I haven't decided yet where to place battery and 22a julet controller, despite the frame being a S the frame the triangle is a decent size. I have a pair of 8ah 10s lipo which I will press in service both give about 25 miles, I may have to ut my thinking cap on and construct a GRP triangle...

The best part of the kit is the Bafang hub so that one bit of kit not needed, I'm surprised you have a speed sensor as I would have thought the hub would have an internal one . Check the motor wire and count the wires if it has nine wires then it has internal speed sensing. As it is your...

I don't like the last option of topping and tailing though with a bit of fibreglass solid sheet in between will be ok. K you could use one of those tiny top tube silly pannier bags, sit 5p1s in each side just and then parallel them together using equal wire length before it exits to the...

The issue isn't vibration with nuts but the torque affect on aluminium fork drop outs, if they are meaty/thick then ok with Torque arms but if Rockshock type they will crack.

The Rat is starting to take shape now. Wheels, forks fitted, steerer cut down and bars added.. Discs are on and crank set on, for now will go with single 36t to see how it goes when done. Steerer currently set at similar height to my existing bikes plenty to come down if need be.

The controller case if you have the broken bits can be repaired by suing a fibreglass repair kit using thin GSM matting material kits, fibreglass is really simple to use if you plan what you are doing. Cut the glass matt to size required, a braid the plastic it is to go on to with 60 grit ali...

As Ben and I have mentioned the axle is 12 x 10mm not 9mm like QR's , the 12mm means the axle and wheel physically sits 3mm lower so the flat edges of the axle do not sit fully in the drop out (unless they are strangely much longer drop outs then one would normally find ). The drop outs often...

Steel forks are stronger and only need the nuts to be done up tightly if you keep to 250w.

Your issue is not why one of the cheap ebay 48v batteries aren't up to but finding one with the minimum 30a discharge required just to work without the voltage collapsing because of the current demand. Each motor has a different current demand and batteries also have different current discharge...

The Sony VTC5 or the Sam 25R that Daniel linked to is about the cheapest you will get off the shelf that will do the job without failing after 6 - 12 months. The cheap ebay ones you are looking at 10ah or so will be no good, despite what sellers claim they are only interested in making some...

Still needs to spend proper money on a battery even for speed.

Sony VTC5, cells rated 20a battery is 30a continuous. A soft pack with triangle frame bag. This is the cheapest best battery you will find with 20a rated cells...

Lifepo4 50a continuous this will work but the battery is quite heavy at 19lbs, it is a soft pack so needs to go in a back pack (not advisable) or in a rack bag or in large triangle bag. The battery is a safe chemistry format using lithium iron phosphate, the voltage range is very different to...

The only place I know is DAS KIT in Germany but they are OEM only afaict. There were plenty of us who bought the kits some four or five years ago so likely there are some unused ones around, I have two empty cases and the old controller base but am keeping hold of them as I like the style of...

Daniel has mentioned one but it is too steep for your pockets and that is a low Ah one. Buyers are seduced by the claimed power and speed which are both illegal and are leagally gettable on a cheap moped and some of the reviews left buy buyers. One buyer said I use it on 250w setting because it...

The battery linked to won't cut it or last too long it is only 25a rated continuous and the controller looks to be 28 or 30a +1 capable ( the label isn't very clear to read). You need a battery with at least a 40a discharge current spec .

As Daniel has mentioned you need to supply links to the items, the controller for the 1kw kit will have an amp rating and any battery will need a continuous amp discharge rating in excess of the controller rating. The 1kw D/D kits are power hungry and even the £320 one using top Samsung 20a...

Your chain ring is 4 bolt 104bcd, simply unbolt and replace. There are some China branded narrow wide nice aluminium ones on ebay, I have recently replaced mine as thye were looking a bit worn after nearly 8 years.