Lbxpdx

I just found a lugged 91 750 for $20 on CL. Score! Sadly it has no fork and the rear brake Canti bosses are completely gone.

Any recommendations on front forks? I know the 750 had a slightly longer rake of 50mm vs the standard 43mm on other models.

Also, any particular reasons why I should get new bosses brazed on or just go with center pull brakes?

Jmpierce

That's too bad about the modifications to this frame. You can get a replacement fork but I would try to get one with the same rake as it was speced with. It tracks very smoothly with the correct fork. I'm not sure how it would handle with a fork with less rack.

You can probably make center pull brakes work, the nice this about the canti brakes are the clearance for bigger tires.

These were very well built frames, the 91 was still made at Trek in Wisconsin I believe.

good luck with your build and welcome to the forum.

hokiefyd 

Search the technical manuals on vintage-trek.com for the fork specs. I think the 750 consistently had 50mm of offset throughout the years. Some of the lesser models had 40mm offset forks.

You should be able to use centerpull brakes. The reach on my '97 750 is 65mm, which is well in line with many centerpull brakes, including Weinmann/Dia-Compe 650s, MAFAC Racers, etc. The Dia-Compes usually have weaker return springs than Weinmanns do (which I generally prefer, personally). MAFAC Racers feel about the same to me as Dia-Compes. I have a bike with the MAFACs with Kool-Stop salmon pads and it stops as quickly as any other bike I own.

I think all 750s were made in Wisconsin.

Lbxpdx

Awesome. I was looking into having bosses brazed on, but the cheapest I can find locally is $70 a pair and I can buy the bosses for $1.50. My buddy welds, but I'm not sure if he has brazed before. I would like to get it fixed for as cheap as possible, but I may just spend the money on decent brakes. I was looking at the Dia Compe 610's but it would seem that they are not long enough

hokiefyd 

Yeah, I think I misspoke on the model name. The 610's reach maxes out just short of what I think you'll need. The longer 750 has a reach of 62-78mm, which would put you right in there. The MAFAC Racer is also a good choice, at about 54-68mm for the most common model.

Center pull brake reach specs

DorkDisk

Vintage Trek's 91 scan omits the page with the geo chart for the multitracks of that year. Luckily, I have it. Rake is 1.8" (45.7mm) which matches the '90 model as well.

Edit: Sorry, my eyes are old. Its 1.6" (4cm) of rake for 91, and does not match 90 (1.8")

Lbxpdx

Thanks for the info guys. unfortunately after closer inspection of the frame, there is some damage that I did not notice when I bought it that will not make this a viable project frame.