Dolan PreCursa geometry table

Based on your findings I got a wild thought that maybe this problem is related to all of their low end aluminum frames. Their sales partners are totally glue-less of any recent change Dolan's made to their geometry tables. Therefore I did a quick cross check and seems like the Dolan Multi X has this same head tube / top tube issue.

Before they shut me down at Veloriders forum I got one response that said something like this: These frames come from China and Dolan does not know what they'll get until they got it.

Seems to me it really does not matter too much what they got. They just bag it, ship it and cash it.

Does anyone have information on the Dolan Kadet 650c frame?

The information available on Dolan's "geometry chart" is (one size only):

1. Seat tube: 390mm c-t
   
2. Effective ttoptube: 545mm
   
3. Head tube: 90mm
   
   

This doesn't give anywhere near enough information to select a fork, which is going to be difficult enough given it's a 1" steerer and we intend to run a front disc brake (for polo).

Mail Dolan and ask which fork the bike comes with - or ping their mechanic Salvador on instagram.

@Emyr, I reckon our options will be this .

*.cc blocked at work, but I know they do a 39cm fork with disc and (26") V-mounts, and various 42.5cm forks.

"normal" 650mm track forks seem to be about 350-380mm, so I want to avoid Oli ending up with something as slack as what he's already riding!

Yeah options are few - and the options are making the polo bike so slack it's agileness are out the back door (69° ht angle with that fork) - good for 650c XC DH klunking though.

Other than that it's gonna be custom stuff, unless we chop down the 39cm one and weld the legs back on at the top. Using 26" instead of 650c will give us a little less length although I imagine most of that will be cancelled out by the slightly bigger tyres we'll be using.

The difference in bead diameter is only 12mm (559 vs 571) so a 26x1.35" tyre should be the same overall diameter as a 29-571 tyre (I've only ever seen 23mm 650c tyres though).

Might end up using a dual pivot caliper or V-brakes with the pads right at the bottom of the slots, if a short enough fork with bosses and the right steerer exists...

Geo first though.

Should I build the rims with a braking surface then? Was gonna use 319 discs.

I can measure the a2c of the stock Kadet fork when I'm in work on Wednesday if you want.

That would be very helpful, could you measure the head angle too?

72'ish

Ah, I been browsing eBay for bits too...

PM>>>

Thanks @M-V

could you measure the head angle too?

Hmm, probably not. At least not very accurately I wouldnt imagine. Unless you can describe me a technique? I don't own a protracter or anything.

Accuracy wouldn't need to be great, a phone app would probably do.

Ok I'll give it a shot then.

Ta muchly.

@snottyotter 336mm a2c and a 73 degree head angle so far as I can tell.

Cheers man, thanks for the help.

If the measurements I took last week are near enough, a 390mm fork would slacken it to 71.8deg...

Looks like the standard cro-mo fork might be the only option, no disc brakes :-(

@emyr Looks like the carboncycles 390mm fork would drop the head angle to about 71, not ideal but could still work alright.

Ha, 71 would be workable.

Or 72 with your proper mathsness, not too bad.

To BikeCAD!

What about a cycle speedway frame? Wilkinson I think.