Woosh Big Bear Chainring.

[Deleted member 4366]

Larger single chain-rings are not very common. If you get a double or triple, you can just leave the extra ones unused. I think your easiest option is a cassette rear wheel, which is by far the easiest option to fit. You don't have to change anything on the bike. You should be able to find a used one for about £15 with the cassette. It takes about one minute to fit without any special tools, in fact probably without any tools at all. You can keep your chain-guard as well. Your top gear will go from 14T to 11T, which will increase your comfortable top pedalling speed from 15 mph to 19 mph.

 

[trex]

garyten and me have about the same cadence, we top out the Big Bear at 21mph while I can top out the Sirocco CD at 24mph because the CD has 11-32T 8-speed cassette. If garyten swaps the rear wheel for a cassette, he'd have 8-speed at the rear while his shifter has only 7. You see the problem.

 

[Deleted member 4366]

You can get cassettes with as many speeds as you want. Here's 7-speed:
http://www.ebay.co.uk/sch/i.html?_trksid=p2050601.m570.l1313.TR3.TRC1.A0.H0.X7+speed+cassette&_nkw=7+speed+cassette&_sacat=0&_from=R40

 

[Deleted member 4366]

Wheel with cassette:
http://www.ebay.co.uk/itm/ALESA-ALLOY-26in-X-1-75-MTB-REAR-WHEEL-7-SPEED-BONTRAGER-TYRE-USED-/281379159791?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item4183813eef

 

[Deleted member 4366]

Another, but note the postage cost:

http://www.ebay.co.uk/itm/Retro-MTB-Wheels-Weinmann-Alesa-36h-Shimano-7-Speed-Cassette-RM40-Altus-/231277833037?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item35d93bab4d

 

[garyten]

Thank you both for all your info.

d8veh, thanks for those links, i assume the wheel will fit in the frame or would i need spacers or stretch the frame to accommodate the wheel and cassette, there must be some difference in the width?

As im not to ambitious yet, i really do like idea suggested by Trex "replacing the 14-34T 7-speed freewheel with 11-32T 7-speed DNP is the quickest (10 minutes top), simplest and cheapest"

Just for the record, my Big bear is fitted with a 14-28, not 34 as advertised, however i find the gears 1 and 2 almost redundant anyway, as i can easily take of in 3rd.

 

[Deleted member 4366]

Wheels are 135mm whether they have a cassette or freewheel. Most cassette wheels have the quick release skewer rather than the nuts on your present one. That makes them even easier. Obviously, you have to get a skewer if the wheel doesn't come with them.

 

[garyten]

D8veh, again thank you, you have a wealth of information, i cannot thank you, and the other posters, enough.

I did wonder why the Big bear didn't have the quick release skewers, now i know.


Lots to think about now.

 

[Cyclezee]

John's out of stock of those free-wheels, so you'd have to get one from Germany:
http://www.ebike-solutions.de/de/Shop/Motoren/Schraubkraenze/Schraubkraenze-mit-7-Ritzeln

The grapevine is obviously working

Yes we are out of stock of DNP 7 speed freewheels right now, our primary reason for stocking them is to supply with our conversion kits and the last one went out on Friday with a kit.

The best place to buy a 'screw on' freewheel removal tool is here
http://www.tweekscycles.com/bike-accessories/cycle-tools/park-tool-fr1c-freewheel-remover-uniglide-shimano-sis

eZee will be introducing a rear motor with a cassette freewheel motor in the not too distant future so eventually we will phase out 'screw on' freewheels.

 

[garyten]

Sorry to resurrect this topic,but i found this on Ebay,

Will this fit my Woosh Big Bear, ( 14-28) one tooth lower in top, might just be enough.

click on it to see,

Shimano freewheel MF-HG37 7-speed 13-28

 

[Deleted member 4366]

Yes