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Given those clearances it makes one wonder if bicycle could have been an export model made for 27" wheels. Sounds a bit odd for this late.
Wonder if it is conceivable it could have been intended for path/cowtrailing application so owner could run large cross section tyres. Is shell height in the normal range for a road machine or is it a bit on the high side?
What are the brake centers like with the 700's mounted?
Thank you for the information regarding the headset!
And thank you for the update.
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