Bikedued

We've all seen them, the quill convertors that allow you to install a threadless stem on a threaded fork. I have an old Burley tandem that will be a compromise between two height extremes. I figured it was probably better for me to be raised up higher
and extended out front a little, than the stoker being on too tall of a bike. Plus the bike was foud that way. Are these considered
fairly safe? I need a good 3-4 inches of rise to put the bars where I need them, and I have a nice 115mm threadless stem that will put me about where I need to be. I want to run drop bars about level with the saddle for long distance comfort. To give you an idea of what I am up against, here is the bike in as found condition, with the saddle up front at the height I need it for correct leg extension. Maybe I should drop the cash for a technomic deluxe and call it a day?,,,,BD

Forgive the condition, it is a recent acquisition, and will get the full treatment.

Bikedued

Also.... How do you go about keeping the stoker bars from hitting your thighs on the back of the pedal stroke? It might need to be closer to their saddle as well, so I hope a longer clamping stem is available. Sorry
I am VERY new to tandem cycling.,,,,BD

cyclist2000

Another option may be to get a new fork with an uncut steerer and place enough spacers to raise the threadless stem to the height that you need. and if the uncut steerer isn't long enough then raise it even further with a threadless stem riser.

cyclist2000

It looks like the stoker bars are angled down too far, I don't have a tandem but I alway thought they needed to be angled upward
look at the santana tandem site to see how the bars should be set.

Bikedued

Yeah I figured that might be part of the problem. Since the aero position will be unimportant given my height, I may put a nice set of alloy north roads or similar bar in it's place. The
existing ones are just flopped and chopped versions of the front bars.,,,,BD

HillRider

I installed a Nashbar 1" threaded steerer to 1-1/8" threadless stem adapter on an old Trek so I could use a pair of 31.8 mm handle bars and it's worked well. You can get 1-1/2" to 2" height from one of these but certainly not 3" or 4". An "up angle" (+/- 10°) stem may help but the Technomic is about the only thing that will get you as much rise as you want, other than a new uncut threadless fork.

DieselDan

Here is one example:

Bikedued

Yep, kind of what I need to do. I know where a chrome threadless fork is, that will look great with the semi vintage look of the bike.,,,,BD

I do have a C'dale fork from a very large frame. I don't know about it handling the weight of the bike plus two people... Hmmm

Garthr

You can get a taller threadless stem adapter like this from Velo Orange https://www.velo-orange.com/vothstad.html
Combine it with https://www.velo-orange.com/vost17ri.html or https://www.velo-orange.com/vost625.html and you'll get plenty of height.

However, in truth, from what you have shared here...... the frame is just too small for you. A stem is meant to compliment the fit of the bike ..... not make or break it.

Bikedued

Well, which would be more acceptable? A 6 foot tall person riding too small a bike with a taller stem, or a 5 foot tall person riding a 22 inch? Besides the bike is as found, I didn't go shopping for it. Thanks for the info though.,,,,BD

Bikedued

I clicked the quill adapter link....Hmmm, I will have to change the fork anyway, as it is a 22.2 on the bike. Not
quite new enough to get a 1 1/8". Can I find a standard cup headset to fit this frame, that will accept a 1 1/8" stem. Yes the fork will be changed. From cost factor alone, I am leaning toward the super long C'dale
fork I have, trimming off the threaded end, and converting the whole thing to threadless. It will look kind of like the setup on a lot Surly LHT's I've seen.,,,,BD

HillRider

The quill adapter shown in the Velo Orange link fits a 22.2 mm ID steerer (i.e. the ID of a 1" steerer) but takes a 1-1/8" stem so all you will need is a new threadless stem. The adapter allows 110 mm or more than 4" to stick up above the headset's lock nut.
The headset isn't the issue as your current fork and headset (both 1") will accept the quill adapter as shown. You don't need to change the fork or headset. Your frame will not accept a 1-1/8" steerer or headset anyway.

nahh

this.

zzyzx_xyzzy

I'd be a little leery of swapping a single-bike spec fork onto a tandem, especially one with a 1" steer tube. My other feeling is that north roads on a bike that's already small for you would leave you pretty cramped -- moustache bars would work better and you could save the existing brake levers.

The regular technomic is a good way to go--you can get up to a 130mm forward extension and they're $45-60 if you shop online.

Bikedued

North roads, on the back. Never said anything about them on the front? Sorry I looked at the stem size on the adapter description. Oops.,,,,BD