DNP 11t

[garyten]

I am just about to order a DNP 11 28t for my Big Bear, and i have bought the Park Freewheel removal tool.

Are there any other parts i would need, like spacers, shims etc ?

Is it a like for like fit, no shifting issues or spacing issues between the cogs etc, as i will be removing a Shimano 14 28t, to use the DNP.

I have done lots of searches, and DNP is not always that well liked, so i thought better to ask someone, or are there any good reasons why not to buy a DNP 11 28.

I did read or poor quality control, and a debate on 11 tooth cogs causing premature chain wear, but im still willing to consider one, unless someone here would like to share any bad experiences.

 

[mike killay]

I have used Shimano and Sram 11 tooth cogs on my Tonaro. Neither last very long. In fact, I reckon that the manufacturers should supply the cog set with a few extra 11 tooth rings.

 

[Alan Quay]

I have used Shimano and Sram 11 tooth cogs on my Tonaro. Neither last very long. In fact, I reckon that the manufacturers should supply the cog set with a few extra 11 tooth rings.

I saw some on eBay the other day. They were about £5 each if I remember correctly.

 

[Deleted member 4366]

I have used Shimano and Sram 11 tooth cogs on my Tonaro. Neither last very long. In fact, I reckon that the manufacturers should supply the cog set with a few extra 11 tooth rings.

If you use a 11T on a crank drive, it'll wear out very quickly because of the large power going through it from the motor plus the pedalling.

The same applies to people on non-electric bikes using DNP free-wheels. They're not the best quality, so somebody doing off-road stuff standing on the pedals all the time wil probably break one.

When you use a hub-motor with one, there's hardly any power going through it, so it'll last for ever, especially if you have a strong motor like the Woosh Big Bear. I have them in several bikes and I've never had a problem or seen any wear.

If you choose a DNP free-wheel with the same number of speeds, you shouldn't need to change anything. The most you will need is a washer if the inner stop of the axle doesn't reach outside the free-wheel.

 

[Cyclezee]

Are we talking 'screw on' freewheel or cassette
Doesn't the Big Bear have a front motor in which case it would be a cassette
BTW, the Park Tools remover doesn't work with 'screw on' freewheels, you need a special one that passes over the axle,

 

[Alan Quay]

Sorry, I was talking about cassette, where the last two sprockets are seperate from the rest of the cluster.

 

[trex]

I think Woosh use 7-speed screw on TZ21 freewheels on their bikes.

http://www.halfords.com/cycling/cycling-parts/cassettes-freewheels/shimano-mf-tz21-7-speed-bike-freewheel-14-28-t

 

[garyten]

I can confirm it is the Freewheel.

I can get the Dnp for £22 from china, i can also get a sunrace 13t, but some have said its only similar in quality to the Dnp, and only a 7% change in gearing.

I can also get a Shimano HG37, 13- 28T, from Germany, for £15,and i reading the reviews on Amazon.com, the tz21 shimano is better, so confused again, LOL.

I am willing to try the DNP, for £22, what harm could i do?

 

[trex]

I think you would be better off checking with Woosh if they can sell you a a Sirocco CD rear wheel. It's a drop in replacement for your rear wheel, but you can select a 7-speed cassette to suit, like this one:
http://www.halfords.com/cycling/cycling-parts/cassettes-freewheels/shimano-cs-hg41-7-speed-cassette-11-28t

The total wheel + cassette will probably costs more than £22 but should be in the region of £30. The upside is having choice of cassette.

 

[garyten]

What a great idea, Trex, i didnt know the Sirocco used a cassette.

I will get in touch with Woosh, and see whats possible, as i dont know what gearing the sirocco uses, but i will find out.

Great forum this, you lot have a great wealth of info, you all have been so helpful.
Thanks.