120 dropout 35/37 with guards tyre clearance frame suggestions please

I like my old orbit 531c tourer frame FG/SS set up, but I'm limited to 28mm tyres with clearance for mudguards and I want 700 x 35/37 with mudguards.

Seen a Pompino, front clearance would be fine, but doesn't look much better at the rear really.

Tried a Crosscheck which has clearance for even wider tyres but 42mm chainline gives very limited chainring size.

Tried an old Bob Jackson 27" 531 frame which had a bit more clearance with 700 wheels, but it felt really compared to Orbit. Not sure what was going on there.

Is there anything in between the Pomp and Check in steel at the same sort of price?

Maybe difficult to find something that takes the really wide setup with a 42 mm chainline and that why the cross check and pompino are like they are. Have you emailed on one to asked what tyre with gard you could fit on the rear, you may be surprised. Optical illusions and all that.

Why does the 42mm chain line give very limited chain ring size? The width of the tyre being used and spacing of rear hub will determine the minimum chain line, but then you should be able to pick any crank set you like and just get a wide enough bottom bracket to make it work. I can't figure out how a different frame would change the equation here.

I'm looking at my Crosscheck now and got to say I love it.

Also why do you need to run a wide rear hub in the Crosscheck? You can use a standard 120mm rear hub spaced out to 135 so should give you a standard chain line and don't think the BB or stays will stop you running a big chain ring on a standard chain line.

650b rims?

Mmmm, maybe I'm remebering wrong. Perhaps I could ask this differently...

Can the Crosscheck run a 42mm chainline and say a 42T chainring?

And what's the max rear tyre a Pompino can take with / without mudguards?

Looks like it should be able to, but thats just by eyeballing it. Why such a big chain ring?
Other option would be tor run goldtec hubs with a 45mm chain line then a 42t would fit for sure plus you would have some amazing long wearing hubs too.

Late night 'fuzzy brain' in action. The morning reminds me the difficulty I had with the CC was not being able to tighten the rear wheel sufficiently with a q/r. Could have been easily solved with a bolt on hub. The chainring / chainline limitation came up with a 1x1 which was designed for 135 hubs and middle ring chainline.

I'm being a cheapskate and don't want to change wheels which are 120 hub spaced for 126mm.

I'll check with On-one it's likely that by loosing a bit of chain adjustment capacity the wheel can be set back further in track end to give a bit more tyre clearance.

Get an old Pathe frame.

Late night 'fuzzy brain' in action. The morning reminds me the difficulty I had with the CC was not being able to tighten the rear wheel sufficiently with a q/r. Could have been easily solved with a bolt on hub. The chainring / chainline limitation came up with a 1x1 which was designed for 135 hubs and middle ring chainline.

I'm being a cheapskate and don't want to change wheels which are 120 hub spaced for 126mm.

I'll check with On-one it's likely that by loosing a bit of chain adjustment capacity the wheel can be set back further in track end to give a bit more tyre clearance.

That makes sense, the other opton with the Crosschesk would be to run chain tugs if you really want QR hubs. I've never tried it myself but I'm sure that it works ok, but I I'm not really a fan of the fixed gear with a QR hub. The forward facing drop-outs on the Crosscheck make removing the rear wheel far easier if you have full length mud guards on too.

Get an old Pathe frame.

with all due respect that's easier said than done

Another option would be a Steamroller, fits up to 700*38 with clip on fenders and stays manipulated for up to 50T chain ring with normal chain line. But I think a crosscheck is the way to go, great frames with so much flexibility. You can even fit some 2.1" 29er tyres to go full monster crossing.