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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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    • CommentAuthordereke
    • CommentTimeApr 21st 2020
     
    Power is only one part of the story. The motor legally has to cut out at 15mph.

    So while you could have a 250W motor that "peaks" at 2000W all it means is that you will beat cars off at the lights up to 15mph and then they will knock you off and kill you a few seconds later.

    That is probably why no one rigorously enforces that the motors are only capably of 250W. It just is not a big deal.
  1.  
    Yeah I did read someone fitted one of these 250w tongsheng coupled with a 36v battery and a firmware update in the controller gave some good power

    But still 250w technically as you say
    • CommentAuthorphiledge
    • CommentTimeApr 22nd 2020
     
    Have you actually tried a decent legal 250W ebike? You might be quite suprised how much poke they have.

    If you are set on having something more powerful and illegal, then theres a few other things to consider aside from the police and post accident litigation.

    A 1000W bike may well wear out tyres and drive train 4 x faster than a 250W bike

    My wife has a legal Bosch CX powered mountain bike and she cant start off in the turbo setting because the assitance is too powerful for her to control the bike whilst shes focussing on getting seated/balanced. Ive seen the occaisional bloke do the same off rode getting started on an incline. I assume a more powerful bike would exacerbate the situation which could be problematic with others around.

    Typical cycle riding helmets and clothing are not designed for crashing at higher speeds so if youre doing 20-30 mph and come off, its likely gonna hurt more than it would at 15mph.

    As your on a cycle other road users wont be expecting you to be travelling at abnormal speeds so the chances of them stepping out in front of you or pulling out in a car are probably higher. Unless you upgrade the brakes to match the extra power/speed/weight youll be slower stopping than you would on a proper motor bike.

    Theres lots of very good reasons why ebikes are legally restricted!
  2.  
    Posted By: philedgeHave you actually tried a decent legal 250W ebike? ........
    Theres lots of very good reasons why ebikes are legally restricted!


    Seconded. I've ridden a few modern Bosch e-bikes and some city bikes (Brompton and an ARCC powered bike that cleverly uses Bosch power tool batteries www.arccbikes.com/) and power isn't the issue. What the good ones seem to do increasingly well is delivering it smoothly as you start pedalling and not cutting out so harshly at the 15mph limit.

    Ultimately if you want an electric motorbike, buy an electric motorbike.
  3.  
    I'm going to go for a 250w kit listening to the comments made.

    Is the specialized tricross good for a conversion or should I look for something with some suspension perhaps? Second hand unless of course there's a bargain or there's already done?

    I guess building something creates a sense of satisfaction
  4.  
    Posted By: VictorianecoIs the specialized tricross good for a conversion


    again, that's like asking "should I buy a Mazda Mx5 or a VW Transporter" - they're both good at what they do but the first is no use if your requirements are for the latter.

    Manufacturers are adding electric assist to everything from lightweight road bikes to child carrying box bikes. From memory the tricross is pretty good all rounder - traditional road bike geometry slightly slackened and with wider tyres so it will cope with some gravel tracks and can carry panniers.
  5.  
    I pretty much only ride on the road, with a few coastal paths of grass/gravel.

    I'm finding the ride a little harsh in all honesty and I have the maximum width tyres the wheels will take 28mm Schwalbe

    I'm also finding the riding position a little bit sporty for my needs, I think maybe a Sirrus or similar would suit my riding position a bit better, I just get from A to B not really a long distance tourer

    So maybe a Sirrus or Crosstrail? Or any other suggestions that would suit a conversion?
    •  
      CommentAuthorfostertom
    • CommentTimeApr 27th 2020
     
    I have an ebay search for Orbea Gain XL but nothing coming - what's the best online marketplace for secondhand ebikes?
  6.  
    Posted By: fostertomI have an ebay search for Orbea Gain XL but nothing coming - what's the best online marketplace for secondhand ebikes?


    Orbea Gain hasn't been around that long so you're unlikely to find anyone selling one used (and they must be selling in tiny numbers in the UK at the moment. Orbea aren't a big seller in the UK yet.

    Second hand bikes - eBay, GumTree (definitely the main outlet for stolen bikes), online cycle forums.
    •  
      CommentAuthorfostertom
    • CommentTimeApr 27th 2020
     
    There's are fair number s/h in S M L but not XL.
  7.  
    Just looked up the Orbea Gain, looks a decent kit.

    Simon, do you know what the maximum width tyres I could run on AlexRims 15 is? i read it is 2x the width so 30mm but I reckon if I could get a wider tyre the Tricross would probably make a more comfortable and affordable bike.

    1. I already have the bike
    2. An E-Kit would cost me ~£500

    or look at a brand new base model with hydraulic disc brakes such as the Crosstrail:
    https://www.specialized.com/gb/en/crosstrail---hydraulic-disc/p/173761?color=273727-173761 £575

    or a Sirrus:
    https://www.specialized.com/gb/en/sirrus-mens-spec/p/171199?color=264640-171199 £550

    I could effectively put the bike and kit as an expense against my company effectively saving ~20% in tax so £800 gets me a brand new e-bike more than capable what I need.

    Or if it was over £2000 being flat rate registered I can get the VAT back also so a £2000 bike would end up costing me ~£1200, but splashing £1200 on a bike still doesn't sit right with me.....
    • CommentAuthorphiledge
    • CommentTimeApr 28th 2020
     
    Googling tricross specs suggests the stock tricross has 700c x 32 tyres so maybe room for wider tyres than your 28's. The tyre clearance past the seat/chain stays is often the limiting factor in tyre width.

    The spec that Ive just looked at has cantilever brakes but Im not sure what your bike has? Cantis have never been renowed for being powerful brakes so if you're adding weight and speed Id be looking for a bike with disc brakes especially if your likely to be riding in the wet when rim brakes can be slow to work
  8.  
    Yes mine have cantilevers, I know I can upgrade to V-Brakes cheaply and still keep the existing levers.

    I just don't think the bike is really geared for a conversion if I need to upgrade brakes, wider tyres etc.
    • CommentAuthorSimon Still
    • CommentTimeApr 28th 2020 edited
     
    Posted By: VictorianecoJust looked up the Orbea Gain, looks a decent kit.

    Simon, do you know what the maximum width tyres I could run on AlexRims 15 is? i read it is 2x the width so 30mm but I reckon if I could get a wider tyre the Tricross would probably make a more comfortable and affordable bike.
    ....
    Or if it was over £2000 being flat rate registered I can get the VAT back also so a £2000 bike would end up costing me ~£1200, but splashing £1200 on a bike still doesn't sit right with me.....


    You were looking at Tesla's the other day - get your priorities right.

    Posted By: philedgestock tricross has 700c x 32 tyre


    Could be a different model year of course.

    The widest tyres you can run are the widest you can fit in without interfering with the fork/frame or brakes. Tyre sizing is woefully inconsistent so while one manufacturers XXmm tyre may be fine another manf's might not. If theres's space around the tyre try something larger. Go to a shop with the bike and ask?
    • CommentAuthordereke
    • CommentTimeApr 29th 2020
     
    Posted By: Victorianeco
    I could effectively put the bike and kit as an expense against my company effectively saving ~20% in tax so £800 gets me a brand new e-bike more than capable what I need.

    Or if it was over £2000 being flat rate registered I can get the VAT back also so a £2000 bike would end up costing me ~£1200, but splashing £1200 on a bike still doesn't sit right with me.....


    You could also use the cycle to work scheme to buy the bike which could give you up to 40% off if you are a higher rate tax payer.
    • CommentAuthorRobL
    • CommentTimeApr 29th 2020
     
    I have a specialised sirrus pro, had it from new (2007), probably gone around 50k miles with it. Almost everything has worn out and been replaced, 2 lots of wheels, loads of chains and gears etc, but nothing I couldn't do. Crashed it a couple of times (slipped once on ice, once on oil near petrol station), never damaged the frame.

    My comments on it for you:
    The different models of sirrus look similar, but the better ones have bits of carbon fibre and "Zertz", which make the frame less jarring, which Aluminium frames alone can be.
    The bike is "twitchy", having a short wheelbase.
    They've been making similar bikes for ages now, so lots of 2nd hand stuff available - try & get a bit of history on it to avoid nicked ones.

    https://www.bicyclebluebook.com/value-guide/product/16659/

    A friend of mine bought a £400 new e-bike a few years back. It did 14 miles/hour for 12miles, which was enough for him. It felt like a death-trap though - the steering had effectively positive feedback, so it would jack-knife if you took you're hands off - he wouldn't signal with it, as it felt like he'd fall off!
    •  
      CommentAuthorfostertom
    • CommentTimeApr 29th 2020 edited
     
    Posted By: RobLthe steering had effectively positive feedback
    Someone had messed with it, to create competition mountain-bike extreme responsiveness.

    Like the Wright Bros' revolutionary development was to abandon that kind of self-correcting kite-type stability, and instead to require the pilot to actively maintain course and attitude all the time. Modern fighter planes carry that to extremes, relying on electronics to instantly correct. Such a plane can fly along 'standing on its tail' or even flip end to end to thrust 'backwards'.
  9.  
    Specialised Crosstrail any good?

    2019 model with mechanical brakes exact same as this one:
    https://www.specializedconceptstore.co.uk/product/12164/2018-crosstrail--mechanical-disc/

    I can get for £250 local to me, only used a few times since last year
    • CommentAuthorRick_M
    • CommentTimeMay 6th 2020
     
    Like Simon said, measure the space between your tyre and frame and see how much space you have spare to fit bigger tyres. Look for the narrowest points eg the gap between your chainstays and the rear tyre, you might have a few mm spare which means you could fit bigger tyres.

    If your rims are 15c wide, you could fit 32mm tyres according to the charts:

    Which tire fits safely on which rim?
    https://www.sheldonbrown.com/tire-sizing.html

    Also if you don't like the riding position you can change it a lot, is the stem at its maximum height, could you swap it for a shorter angled one? Maybe you could make the riding position as the same as the one you've linked to.

    Another option could be finding a cheap old mountain bike and swapping the tyres for smooth ones so it will do the road riding you want but at low pressures so it feels soft. And it would be completely different from your current bike so you could figure out exactly what kind of riding position you like. And if you don't know already it would be a way of learning how to fix things on a bike as presumably it will need some work.
  10.  
    Posted By: fostertomSomeone had messed with it, to create competition mountain-bike extreme responsiveness.


    Even Cross country race mountain bikes are slacker than road race bikes or cyclocross bikes like his Specialized.

    I wonder if the fork was on backwards - have seen that more times than you'd think and it's the only thing I can think of that would do that to the handling
    •  
      CommentAuthorfostertom
    • CommentTimeMay 7th 2020
     
    'Slacker' means more self-centring, less twitchy?
    • CommentAuthorBeau
    • CommentTimeMay 7th 2020
     
    Posted By: fostertom'Slacker' means more self-centring, less twitchy?

    Yes. Like a chopper bike. Boring but safe
    • CommentAuthorphiledge
    • CommentTimeMay 8th 2020
     
    Boring but safe


    In theory, but reality is modern geometry is just as envigorating as bikes from decades ago, and theres plenty that will testify that its still just as easy to come a cropper!!
    • CommentAuthorBeau
    • CommentTimeMay 8th 2020 edited
     
    Posted By: philedge
    Boring but safe


    In theory, but reality is modern geometry is just as envigorating as bikes from decades ago, and theres plenty that will testify that its still just as easy to come a cropper!!


    As a mountan biker I cant agree with that but it may be the case with road bikes. If it was like a car the latest offerings are like driving a nice Volvo, everything works very well but its not exacly exciting. My old MTBs were like an old school Mini where you felt conected to everything but 60mph feels like 100mph :bigsmile:
    •  
      CommentAuthorfostertom
    • CommentTimeMay 8th 2020
     
    Posted By: Beaulike an old school Mini where you felt conected to everything but 60mph feels like 100mph
    or in my case any Fiat up to 2000, totally 'alive', after that became just standard Euro-cars. Sadly, now just disposing of my last old Fiat, quite looking forward to all-electric, even self-driving so I can read a book while 'driving' - there's other ways of feeling 'alive'!
    • CommentAuthorphiledge
    • CommentTimeMay 8th 2020 edited
     
    Posted By: BeauMy old MTBs were like an old school Mini where you felt conected to everything but 60mph feels like 100mph


    Possibly due to lack of suspension, brakes that worked when they wanted and bars as wide as stems were long. Much like original minis aside from the bars!!
   
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