Shimano Freehub question.

[Roadman80]

Hello all,

Could someone tell me if it's possible to put a 8 speed Shimano freehub straight on to my Shimano RX 100 rear hub,it's currently wearing a 7 speed freehub?. Just wondering if it's an easy swap.

Thanks,Dave.

 

[carlrh]

Dave it can be done but it takes a bit of work. The 8spd body is wider so you have to change the axle/axle spacing and redish the wheel. we use to do it a lot back in the day with xt hubs 7 to 8 speed using road 8spd freehubs.
What year is your RX100 some have a washer behind the freehub that you can remove helps with spacing.

Carl

 

[Roadman80]

Re:

Thanks Carl,not sure of the year but it's a RX100 A550 Hub,it's new and cheap so i took a gamble as i want to build a new set of wheels for my old Raleigh M-Trax 400,the old wheels/hubs are getting a little tired now. I'll take the freehub off tomorrow and see if there is a spacer there.

Dave.

 

[Roadman80]

Re:

Forgot to say Carl,i'll also check for a datestamp too although i could'nt see one earlier. Do you know where the letters would be stamped?.

Dave.

 

[carlrh]

:cry: Dating hubs is difficult lol
ive got shimano parts catologues going back to 1982 theres a few years missing :cry: they have blow up diagrams showing parts and part numbers if you have an idea of year can have a look and send you a copy have to be monday as its my weekend off and i keep em at shop.
Carl

 

[carlrh]

Re:

DAve had to callin to work so took quick pic. The washer behind freehub you can loose as long as its a washer not a rubber seal, you will need to put a spacer from the left hand side across to the right as well to accomidate the wider freehub then dish the wheel.

Carl

 

[Roadman80]

Re:

Thanks Carl for your efforts,i appreciate it. I've now got two rear hubs and one is an 8 speed,trouble is it is a 32 hole and has the dating letters RJ which equates to Oct 93 and i have a 36 hole 7 speed with dating letters OA Jan 90.

Can i strip the two down and make something out of the two,basically need a 36 hole 8 speed rear hub and while i've never done it before i have some mechanical understanding and don't mind learning but don't want to bother if it's not feasible.

Thanks.

 

[hamster]

In short yes. Shimano hubs are basically all the same design. Use the hub body, seals, bearings and cones of the 36 with the 8 speed spacers and freehub unit and you should be fine. I have even mixed parallax and earlier 'apple core' types and it usually all goes together fine. You might need to swap a few of the smaller spacers about to get the OLN dimension exactly right.

 

[Roadman80]

Re:

hamster/Carl,thanks for your help,i'll take your advice and give it a go.

Thanks,Dave.

 

[hamster]

You can even update earlier 'apple core' early 90's hubs to take the later parallax conical rubber seals - the shell diameter is the same. I love my frankenhubs.