Linear Chain Push design for multi external cogs modification on Brompton (e.g. 11-28T 7 speed)

bikegang.store/...
All New Design Ultra Wide Gear Range with External Cogs for Efficient Drive
Features :
1. Stock Rear Frame Compatible without filing
2. New Jockey Wheel with Enduro bearing and Linear Chain Push function
3. New Tensioner with Longer Arm to take up to 28T cog
4. New DR cable set with reinforced spring and linear push function
5. New Chain Pusher with linear push long travel (7 speed)
6. New Hub (wheel) with wide free hub body to take cassette sprockets

[@2ai]

In my experience, when the upper pulley for Brompton is pushed farther away from the wheel axle, to make it work with larger cogs, it quits shifting over the smaller cogs. The latter is because the chain struggles to grab the subsequent cog when the pulley is too far away. While it may be possible to fine tune the system to make it work long enough to shoot a video on the stand, it is likely going to be disaster in practical use.

[@BIKEgang]

This is why the chain pusher and DR Cable Anchorage & Spring Set have to be redesigned.

[@2ai]

@@BIKEgang The problem is not with the pusher but the wheel being too far from the cog cluster. On a regular bike the tensioner wheel moves along the cluster of cogs maintaining approximately the same distance from the cogs, You claim that you can jump over the physics and engineering and do miracles.

[@jackywu2784]

Where to buy? Can't seem to purchase on your link

[@BIKEgang]

we will be using differnt approach for external multi-cogs modification (similar to P Line 4 speed upgrade). please stay tuned there ===> kzbin.info/www/bejne/pn2ocod9iNaCa7c

[@antoinegardette1002]

Hello Is this item still available ? The link goes to a 404 page.

[@TwistedWheels]

Hi, what shifter and cassette are you using?

[@BIKEgang]

Cassette is included 9speed sram shifter

[@bush-radler7326]

hi. thats very interesting...where do i get more infor information?

[@BIKEgang]

bikegang.store/RT5QE follow the link, will keep updating the description.

[@bush-radler7326]

@@BIKEgang thanks

[@smithsteven5696]

How much?

[@firesome11]

Can this be possible for Birdy?

[@BIKEgang]

No, why do you need this for Birdy, it can already take cassette type sprockets

[@firesome11]

@@BIKEgang as compact as it is, it's better for GT and it will be easier for folding.

[@BIKEgang]

@@firesome11 The wheel size is not compatible. 349.. and the rear hub is not for sale alone.

[@BIKEgang]

bikegang.store/RT5QE please follow the link for more info, will keep updating the description.