Whats the most modern 31mm front end out there?

[jfman]

If your bike has 31mm triples and youd like to keep them. What is the best front end you can score for it?

I would prefer they be on the longer side of things.

any modern dirt bikes run 31mm forks that are worth using in a vitage DS build.?

 

[hillsy]

According to this:

http://www.dotheton.com/forum/index.php?topic=20950.0

It's the Honda CB-250 "Nighthawk" (91-04).

I wouldn't think any modern dirt bikes would run anything that skinny nowadays.

 

[Bellicose]

My 1988 CD250U runs 31mm as well.

But this is about as "modern" as ya gonna get with that size.

CB 250 M/N/P/R/T/W/X/Y/1 Two Fifty MC26 91-03

 

[jfman]

Thank you guyz.

The CB is the honda rebel right?

 

[Bellicose]

Thank you guyz.

The CB is the honda rebel right?

Nope, the Rebel is a CMX and they have 33mm forks.

The CB 250 is the CB two-fifty, i've got a funny feeling it's a "Twinstar" or "Nighthawk" in the states, not 100% on that tho'.

 

[VonYinzer]

No matter how "modern" the forks are, the most upgraded thing about them will likely be the brakes (which wil likely not work with yoir stock wheel) and possibly the internals. So, they may perform slightly better from a damping standpoint but they're still going to be flexible and "wobbly" no matter the other updated features.

 

[jfman]

Nope, the Rebel is a CMX and they have 33mm forks.

The CB 250 is the CB two-fifty, i've got a funny feeling it's a "Twinstar" or "Nighthawk" in the states, not 100% on that tho'.

Thank you for this clarification!

 

[jfman]

No matter how "modern" the forks are, the most upgraded thing about them will likely be the brakes (which wil likely not work with yoir stock wheel) and possibly the internals. So, they may perform slightly better from a damping standpoint but they're still going to be flexible and "wobbly" no matter the other updated features.

Wanting to go from drums to disc w/o swapping the triples.

 

[VonYinzer]

That's an issue. Not all forks are the same when it comes to spacing. Nor are the wheels obvioisly. You may find modern 31mm forks and the wheel you'd need for them, but its unlikely they'll fit into your trees.

 

[skatetheame]

You might just look into a complete front end swap. Press the old stem into the new lower triple or find bearings to fit the new stem.

 

[Bellicose]

You might just look into a complete front end swap. Press the old stem into the new lower triple or find bearings to fit the new stem.

I agree, would work out easier in the long run i'd say.

 

[AgentX]

Install valve emulators in the current fork. They work really well and spare you a massive amount of hassle if you want to keep things the same on the outside. (Head bearings, brake, clamps, wiring, headlight, fasteners etc. etc.)

I have YSS brand valves in my 35mm fork, but Racetech is probably where it's at. Since they didn't answer my emails and I live in time zone that makes calling inconvenient, I went with the company who'd communicate with me. Easy to install with some minor drilling needed in the pumping rod and a few coils cut off the stock spring and ground flat again (unless you want more pre-load, in which case you don't need to cut the spring). YSS will provide a spacer if your pumping rod is flat on top rather than cupped.

By all accounts Racetech is great people and a superb product. You could even just send them your fork for a total workover, I think; springs, valve emulators, and all.

 

[jfman]

Just found out that the cbr125r has 31mm forks as well.