Walrus Double-Standard Frankentandem

I've been driving my daughter to school, driving home, getting my bike and riding to work. This is silly.

I need a adult/child tandem, so I can get her to school, then get straight to work.

After some doodling, measuring and chin scratching I've got these:

Front half will be an On-One Pompino, the back half a Charge Iron.
A Pompin-Iron, if you will.

It is going to be either a) awesome or b) a horrendous, ugly, expensive pile of crap.

Have you consulted Ed on the design?

I cannot wait to see the amazingness of this!

much as I like the name, would a tagalong be better and cheaper?

Don't discourage him / her (?) this is going to be brilliant! I love shit like this but have none of the skills to do it myself so watching someone else is great.

much as I like the name, would a tagalong be better and cheaper?

Quite possibly, but longer and harder to carry up and down the stairs I need to navigate to get to the work bike shed. I can't leave the tag-along bit at her school as I don't pick her up (that happens via a trailer with her little brother in too).

Also less fun.

On-two?

On-t'other?

Two's-Up?

Loved this project, eagerly awaiting this next one!

Yeap, i'm thinking a) awesome.

as for name, Il Pompironi has a nice ring to it.

Cool! Please do post the design/engineering detail here - very interested in following the development, hurdles, etc.

If you squint a bit, and try to imagine a beautiful paint finish, front tyre, boring bits like cranks, saddles, brakes &c &c this gives some indication of where I'm going with this (constant uphill bike!!):

Back end is not brazed to the front yet, I've got a nice chunk of proper tandem bottom tube to connect the BBs. So far I have just brazed a half sleeve of old headtube to the Pompino seat-tube to get the right diameter for the larger Iron headtube to fit nicely.

Little and Large wheelset of a 24" (507mm) Sun-Ringle Ryhno Lite 36h with a Alfine 8 hub, and a 700c Mavic TN317-disc with a Deore hub on the front. Matching white wall tyre is in the post.

The Iron is listed as 24" only, but it looks like I could easily get a 26" in, and as I'm using disc brakes and removing the canti bosses, their position isn't a problem. Maybe an upgrade for later, as it will give we a much better choice of rims and tyres. I quite like the proportions as it is, but have no idea how it will feel/behave.

That is insane. I love it.

A nod to Phil Mitchell's festive predicament in bike-form

Absolutely brilliant! I think I've seen the Walrus Continental on my commute before so hoping I spot the tandem in the future

This thing is amazing. Good work!

I'm sorry I ever suggested that tag-along, nice work, will be interested to see how it progresses.

Always a pleasure to see you and your wonderful family on the tweed run sir.
Loved the flyer and continental, no doubt the pomiron will be stunning too.
What are your plans for the drivetrain? left hand drive to attach to captain or drive side? geared chainset on front or rear? all have been done and i've played with most combinations. I like left hand drive to master and geared chainset on the back. Singer style with geared front looks proper daft.
Good luck sir.

Oh, and are you brazing in an eccentric bb shell to tension the link chain or using a mtb tensioner thingy?

Oh, and are you brazing in an eccentric bb shell to tension the link chain or using a mtb tensioner thingy?

I've got one of these:

Which clamps to the rear seat post (Esme legs aren't long enough for the frame yet) so by adjusting the height of this, and the height of the saddle together, plus a possible halflink, I hope to be able to tension the sync. chain okay.

The main drive will run from the front BB, with the adjustable BB doofer running the sync.chain on the non-drive side. I'd rather run it all on the left, but the sync. chain will be coming from above, and so will have to pass the drive chain. I could possibly do this if I could find a 32T chain ring for the granny ring on a triple, but I couldn't (The only short - 102mm cranks I could find had a fixed 32T chain ring). I did pick up a cheap Truvative tandem crankset, so can use that and run just one drive-side ring on that to the 8-speed Alfine. Once Esme is big enough for the regular BB I'll rethink it, until she's on her own bike and child no.2. is on this.

I hope that all makes some sense.

Absolutely ridiculous.

I love it

Makes perfect sense to me. Should work a treat with that setup.
Saw a pair of 100mm ta cranks at a jumble last spring, would have been just the ticket for the youngun end of a tandem like this.
Look forward to seeing the finished article sir.

It makes total sense, it's just the audacity of the project. Ridiculous in the best possible sense.

For the adjustable BB, someone did that at my hometown to their OTP Dawes tandem;