If your riding is flat or you’re fit, maybe you could convert to single speed?
It'll have vertical dropouts, so single-speed would be problematic.
I still think it can be possible?
I built a singlespeed bike with a (much older) Specialized Allez frame given to me by a friend. I chose a 52/19 ring/sprocket combination to get a good gear ratio for flat/undulating roads, but it is ok for longish climbs at 4-5% or even short ones of 8-10%. I did a 3 km climb including 0.5 km at 8% on it yesterday on a 161 km (imperial century) ride and it was fine. I have ridden thousands of kms on the bike and that experience tells me that it would be ideal for commuting anywhere where steep hills are not involved.Oh yes. You'd need a combination of chainring/rear sprocket sized to give a reasonably taut chain, or a chain-tensioner. Neither of these would be suitable for fixed-wheel. Or an eccentric rear hub (made by White Industries, I think) to allow tensioning.
I fitted a Planet X 'Doofer' chain tensioner, available for less than £10. I used it as designed for a few rides but found on rough local roads that the tension arm bounced and the chain was coming off so I modified it to work without a spring*** and manually adjust it as the chain loosens with use.
*** I removed the spring, then added a large washer so the attaching bolt would tighten the arm up against the dropout to stop it moving. I also reversed the direction that the tension is applied, reasoning that the tensioner would be helping to wrap a loose chain round the sprocket rather than trying to peel it off! That has been the case, but the tensioner is a bit noisy in operation. I might try applying the tension in the other direction to see if it is still reliable, but quieter.
The chainline and alignment of the pulley wheel on the tensioner are critical. If they are right then the chain stays on and runs smoothly. If not, it will probably run rough for a few minutes and then fall off!
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