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Going faster on a Dahon Briza D7

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Going faster on a Dahon Briza D7

Old 06-20-20, 02:35 AM
  #1  
Dixie Dean
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Going faster on a Dahon Briza D7

Hi everyone. I have a Briza D7 but find it a bit slow when cycling with others and would like to be able to go faster without compromising my ability to go up hill. I have found threads elsewhere that suggest it is possible to fit a front derailleur to the bike using a large LitePro backet (sorry but I can't post the link due to being a newbie!!)

Could someone with more knowledge than me discuss the pros and cons and explain what I would need in terms of the front crankset etc.to get the desired improvements?
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Old 06-20-20, 05:20 AM
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Cheapest option is to replace your cassette with one that will increase your gear range.
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Old 06-20-20, 07:46 AM
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@kayakindude I'm a bit of a newbie, bike tech wise, so would that be a cassette with more rings or the same number but of different ratios?
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Old 06-20-20, 09:24 AM
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What is a backet? Roger
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Old 06-20-20, 01:50 PM
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Originally Posted by Dixie Dean View Post
@kayakindude I'm a bit of a newbie, bike tech wise, so would that be a cassette with more rings or the same number but of different ratios?
Same number different ratios. I have a freewheel and did just that, swapped out for a 7 speed 11-28. Cassettes have even more options. Here is an 11-28 for $17

https://www.universalcycles.com/shopping/product_details.php?id=47234&gclid=CjwKCAjw57b3BRBlEiwA1ImytlzEYvQKFcd4tZhCeg5HbKOj6scGvtzLiB7cVqMwS f9xEjTXiSqzPhoCmPAQAvD_BwE

I did upgrade to a 56 tooth crank, but start with the cheapest option. My combo gets me riding comfortably around a 16mph average, so between 12-20 mph based on wind and elevation.

Last edited by kayakindude; 06-20-20 at 01:58 PM.
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Old 06-20-20, 02:09 PM
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@kayakindude thanks for that. I'll look further into that option.
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Old 06-21-20, 10:34 AM
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Physics of air resistance is a known factor that can be measured.. going faster, you have more of it..
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Old 06-21-20, 02:34 PM
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I was trying to find the cassette specification as it is now, but it seems impossible to find on the web anyway.
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Old 06-21-20, 08:11 PM
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Originally Posted by Dixie Dean View Post
I was trying to find the cassette specification as it is now, but it seems impossible to find on the web anyway.
D7 should be a 7 speed cassette. Count the teeth on the smallest ring. It may be 12-14 teeth. Moving to 11 teeth will increase your top speed.
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Old 06-21-20, 08:15 PM
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Question: is it a "cassette", or is it a "freewheel"? That makes a world of difference for upgradeability. I would know,...
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Old 06-21-20, 08:25 PM
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Well the good news is it's a cassette. Bad news is it already has 11 teeth.

Next step is count the number of teeth on your crank. I suspect 52 teeth or less.

Last edited by kayakindude; 06-21-20 at 08:29 PM.
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Old 06-23-20, 10:11 AM
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The latest version of the Briza D8 has a 46t crank so likely similar, giving max gear inches around 95.

It might be easier/cheaper to fit some lighter weight tyres than the Schwalbe Marathon to gain a few kmh to keep up with friends. Increases the chances of them having to wait while you fix a puncture though.
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Old 06-23-20, 01:04 PM
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Originally Posted by Falconista View Post
The latest version of the Briza D8 has a 46t crank so likely similar, giving max gear inches around 95.
The 46t can be upgraded to a 56t to really increase your top end, here is mine.
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Old 06-24-20, 05:26 AM
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but, changing the chainring only will affect the capability do go up hill. If current up hill gear is required then , it would need a front derailleur using a bracket, FD twin crankset and chain set (44/56 Road/triathlete set or classic 39/53 road set)
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Old 06-24-20, 05:27 PM
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[QUOTE= Falconista.....easier/cheaper to fit some lighter weight tyres than the Schwalbe Marathon to gain a few kmh to keep up with friends. Increases the chances of them having to wait while you fix a puncture though.[/QUOTE]

+1, I got Dahon EoS D9, also with 24" tire, stock it got Scwalbe Kojak 24x1.5, I think it would be lighter on pedal compare to stock Briza tire 24x1.75.
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Old 06-24-20, 07:44 PM
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Originally Posted by Fentuz View Post
but, changing the chainring only will affect the capability do go up hill. If current up hill gear is required then , it would need a front derailleur using a bracket, FD twin crankset and chain set (44/56 Road/triathlete set or classic 39/53 road set)
True if the OP is not spinning out or barely using the lowest range. I found no issues going my route and still rarely run the lowest cog.
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Old 06-24-20, 11:57 PM
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Originally Posted by kayakindude View Post
True if the OP is not spinning out or barely using the lowest range. I found no issues going my route and still rarely run the lowest cog.
I use my lowest on big hill with my 39 ring but I swap the cassette from 32 to 25
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